HelloRoam offers eSIM data plans for California from S$3.69 a day. Your e SIM connects to local 4G/5G networks the moment you land, no roaming fees. Activate by QR code in under two minutes, fuss-free. Keep your Singtel, StarHub, or M1 number active on dual SIM while your e-sim handles data across 185+ countries.
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212+- 5G support
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California prepaid eSIM covering LA and San Francisco on arrival
Affordable eSIM for California, starting from S$3.69. Local 4G LTE and 5G data on trusted carrier networks in California. Works on all eSIM compatible handphones. California stretches from Los Angeles to San Francisco and your data plan needs to keep pace. A HelloRoam prepaid SIM card California puts you on Verizon and AT&T 5G networks from the moment you clear LAX or SFO customs. Plans start at S$3.69 with no contract. Activate by QR code at home before your Changi flight. HelloRoam backs every order with a 180-day refund guarantee on unactivated eSIMs.
California eSIM with fast 5G coverage
HelloRoam offers eSIM plans for California, USA. Connect on AT&T, Verizon, and T-Mobile 4G/5G networks from the moment you land. Singapore travellers activate before departure from Changi Airport and arrive in California already connected. Plans start from S$3.69.
- Plans start at S$3.69 with 5G speeds
- Coverage from Verizon and 1+ other operators
- Instant activation in under 2 minutes
- 180-day money-back guarantee
- California coverage across major cities
- Network
- 5G
- Plans From
- S$3.69
- Activation
- Under 2 min
- Guarantee
- 180 days
How to Set Up an eSIM in California
Follow these steps to set up your eSIM on iPhone or Android handphone. Works for any eSIM for international travel from Singapore. No replacement SIM, no store visit.
Set up an eSIM on your iPhone with the HelloRoam app
Set up an eSIM on your Android handphone with the HelloRoam app
- 1
Choose your plan and checkout online
Select a data plan for your destination and complete checkout.
2Scan the QR code
Scan the QR code to install your eSIM straight away.
- 3
Activate in minutes: ready on arrival
Your eSIM installs instantly and activates when you land.
4Manage it all from our app
Track usage, top up data, and manage all your eSIMs in one place.
Trip changed? No worries, we've got you covered!
Plans can change anytime, and that's fine. With HelloRoam, you can request a refund on any unactivated eSIM within 180 days of purchase.
Learn more about our refund policyHelloRoam California eSIM vs Singtel, StarHub and M1
When comparing eSIM vs a travel SIM card for California, HelloRoam wins on price. It beats Singtel DataRoam, StarHub RoamEasy, and M1 international roaming add-ons. The cheapest eSIM plan starts from S$3.69, with no activation fee and a refund on unactivated eSIMs within 180 days.
| Feature comparison | HelloRoam | Local provider | Limited data eSIM |
|---|---|---|---|
| Refund on unactivated eSIMs |  Feature available |  Feature not available | Feature not available |
| 24/7 live chat support | Feature available |  Feature available | Feature available |
| $0 activation fees | Feature available | Feature not available | Feature available |
| Automatic data alerts at 80% usage | Feature available | Feature not available | Feature not available |
| No data overage charges | Feature available | Feature not available | Feature not available |
| Instant QR code delivery | Feature available | Feature not available | Feature available |
| Premium California carrier networks | Feature available | Feature not available | Feature not available |
Why Singaporean Travellers Choose an e SIM for California
24/7 live chat support
Need assistance at 2 am before a flight from Changi? HelloRoam support is available 24/7. Message us and a real person responds in under 2 minutes. No bots, no hold queue. Whether you need help with eSIM installation, plan changes, or troubleshooting a connection drop, the support team handles it in real time.
Best eSIM for California: skip Singtel roaming charges
HelloRoam connects to local 4G/5G networks in California from the moment you land, at a fraction of what Singtel, StarHub, or M1 charge for international roaming. Plans start from S$3.69 with no lock-in contract and no activation fees. You pay once and use data freely without surprise overage charges.
Keep your Singtel, StarHub, or M1 number
Keep your Singtel, StarHub, or M1 number active for calls and texts. HelloRoam handles your data through a second eSIM line on any dual SIM compatible handphone. Family and colleagues reach you on the same Singapore number while your travel data runs on a separate prepaid eSIM plan.
212+ carrier networks including California
HelloRoam connects to 212+ carrier networks across 185+ countries. Fixed data and unlimited data plans available. Your handphone switches to the strongest available 4G/5G or 5G signal automatically, where offered by the local network. That means consistent speeds whether you are in a major city, a highway rest stop, or a rural area.
Data alerts before you run out
HelloRoam alerts you at 80% data usage so you are never caught mid-trip without data. Top up instantly from the app without reinstalling your eSIM or visiting a store. Additional data activates in under a minute, keeping your connection live through navigation, video calls, and streaming.
Local 4G/5G speeds
Your California eSIM connects to trusted local 4G/5G networks. HelloRoam picks the strongest available signal for navigation, streaming, and video calls. You get local network speeds comparable to a prepaid SIM card purchased in-country, without the airport queue.
Regional and global eSIM plans
Travelling to multiple destinations? HelloRoam regional eSIM plans cover Southeast Asia, Europe, the Americas, and 185+ destinations in one purchase. Short holiday or long-term stay: choose fixed data or unlimited data plans. One account, no SIM swaps. A single regional plan replaces the hassle of sourcing a new local SIM card at every border crossing.
Hotspot and data sharing at no extra cost in California
Share your California eSIM data with a laptop or tablet using your handphone's built-in hotspot. No extra fees, no setup required. Works on all eSIM compatible devices. This is particularly useful for business travellers who need a consistent mobile broadband connection for their work laptop while abroad.
California eSIM Prices in 2026
Compare HelloRoam eSIM plans for California. Plans start from S$3.69 with local 4G/5G access. No Singtel or StarHub roaming surcharges.
| Number of days | Price (AUD) |
|---|---|
| 1 day | S$4.48 |
| 3 days | S$12.78 |
| 7 days | S$27.62 |
| 15 days | S$53.80 |
| 22 days | S$73.00 |
| 30 days | S$91.47 |
HelloRoam vs Other eSIM Providers for California
See how HelloRoam compares to Airalo, Holafly, and other eSIM providers for California travel. HelloRoam offers a refund on unactivated eSIMs within 180 days, 24/7 live chat support, and plans from S$3.69.
| Feature comparison | HelloRoam | Airalo | Holafly | Nomad | Saily | Ubigi |
|---|---|---|---|---|---|---|
| Refund on unactivated eSIMs | Feature available | Feature not available | Feature not available | Feature not available | Feature not available | Feature not available |
| 24/7 live chat support | Feature available | Feature available | Feature available | Feature not available | Feature available | Feature available |
| A$0 activation fees | Feature available | Feature not available | Feature available | Feature not available | Feature not available | Feature not available |
| Automatic data alerts at 80% usage | Feature available | Feature not available | Feature not available | Feature not available | Feature not available | Feature not available |
| No data overage charges | Feature available | Feature not available | Feature available | Feature not available | Feature not available | Feature not available |
| Instant QR code delivery | Feature available | Feature available | Feature available | Feature available | Feature available | Feature available |
| Premium California carrier networks | Feature available | Feature not available | Feature not available | Feature not available | Feature not available | Feature not available |
| Own branded carrier identity (SPN) | Feature available | Feature not available | Feature not available | Feature not available | Feature not available | Feature available |
e SIM Explained: Setting Up eSIM for California
An eSIM card is a digital SIM built directly into your handphone. There is no physical chip and no SIM tray to deal with. Scan a QR code to activate your e SIM in under 2 minutes on any eSIM compatible iPhone or Android. An eSIM for California works as a prepaid data plan with no airport SIM counter, no replacement SIM card, and no carrier contract. Follow the step-by-step setup guide to get connected before your flight from Changi. guide
Mobile coverage guide for California
California has 4G/5G coverage across its main districts, hotels, and tourist areas. AT&T, Verizon, and T-Mobile provide reliable mobile data throughout the city. California is one of the most popular US destinations for Singaporeans. Direct SIN-LAX and SIN-SFO on Singapore Airlines.
Your HelloRoam eSIM connects on AT&T when you enable data at Los Angeles International Airport. Activate at home in Singapore before your flight from Changi for a smooth arrival.
- HelloRoam connects to Verizon 5G, AT&T 5G in California
- 4G/5G coverage across California and main tourist areas
- Connect on AT&T from Los Angeles International Airport
- Plans from S$3.69, activate via QR code before your Changi departure
eSIM Travel Tips for California
Activate your eSIM before you leave Changi
Buy your HelloRoam eSIM for California before your flight from Singapore Changi Airport. Scan the QR code at home on Wi-Fi, enable data on arrival, and you are connected in California without searching for a local SIM card at the airport.
Keep your Singapore number active on dual SIM
On a dual SIM device, keep your Singtel, StarHub, or M1 SIM active for calls and texts from Singapore. Set HelloRoam as your data line for California. Family and colleagues in Singapore reach you on your regular number without international charges.
Download offline maps before your flight
Download Google Maps or Maps.me offline for California before leaving Singapore. This saves data on detailed map downloads and keeps you covered in areas with weaker signal during your first hours in California.
Compare with Singtel and StarHub roaming costs
Singtel, StarHub, and M1 all offer international roaming add-ons for USA. For stays of a week or more, a HelloRoam eSIM starting at S$3.69 works out cheaper per GB of data used.
Check entry and visa requirements before flying
Singapore passport holders enjoy visa-free or visa-on-arrival access to many countries. Confirm the latest USA entry requirements before booking. Your HelloRoam eSIM keeps you connected for last-minute updates at Changi.
Mobile networks in California: what Singapore visitors need to know
California is served by AT&T, Verizon, and T-Mobile. AT&T has the broadest 4G/5G network in California. Your HelloRoam eSIM connects to the strongest available signal automatically. No manual network switching is needed.
- Verizon
- 5G
- AT&T
- 5G
HelloRoam eSIM vs Singtel, StarHub, or M1 roaming in California
Your data options for a California trip from Singapore.
| Category | HelloRoam eSIM Recommended | Local USA SIM card | Singtel, StarHub, or M1 international roaming |
|---|---|---|---|
| Typical cost | From SGD 3.69 total | SGD 6.42–SGD 32.12 total | SGD 6.42–SGD 19.27/day |
| Details | Plans start at S$3.69 (S$ equivalent). Buy before your Changi departure, scan the QR code at home, and arrive in California on local 4G/5G data. | Physical SIM cards are available at Los Angeles International Airport but require setup time and sometimes registration. An eSIM is ready before you leave Singapore. | Singapore carriers typically charge S$5 to S$20 per day for international roaming in USA. A week of roaming may add S$35 to S$140 to your phone bill. HelloRoam plans start at S$3.69. |
Prices approximate as of . Actual savings vary.
Best time for Singapore travellers to visit California
California is a popular destination for Singapore travellers throughout the year. The ideal period depends on local seasonal conditions. Check weather patterns for your travel dates and book early for peak school holiday periods in Singapore.
Top Attractions in California
Big Sur
Big Sur is a rugged stretch of California coast with cliffs, redwoods, and the Pacific. Use HelloRoam eSIM to stay connected.
Pull over at McWay Falls viewpoint for a waterfall dropping onto the beach.
California Street
California Street in San Francisco climbs Nob Hill with cable car tracks and city views. Use HelloRoam eSIM to stay connected.
Ride the California Street cable car for a steep climb with bay views.
Malibu Beach
Malibu Beach stretches along the Pacific Coast Highway with surf breaks and celebrity homes. Use HelloRoam eSIM to stay connected.
Try El Matador Beach for dramatic rock formations and fewer crowds.
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Reviews
Trusted by Singaporean Travellers
Real reviews from Trustpilot and the App Store, quoted as written.
40k+ travellers have used HelloRoam
Cat
On a trip to Europe, my hotel Wi-Fi was so slow and outside Wi-Fi was unreliable. I couldn’t take it anymore so I got helloroam for a few days. It was tricky to set up correctly because of the primary settings (with my original number). But I reached out to their customer service via WhatsApp. Super responsive and helpful, with specific and clear steps to troubleshoot. Appreciate having 4G roaming instead of being stuck with in and out Wi-Fi during my trip!!
Rated 5 out of 5 by this reviewer
Very good experience! The eSIM was easy to set up and worked great in London. It was much cheaper than it would have been to use my own operator there.
Ilona
Rated 5 out of 5 by this reviewer
metulker
Hard to set up but help was good
Rated 5 out of 5 by this reviewer
Reuben
Really happy with HelloRoam. Everything worked as expected, from messaging and Google Maps through to streaming without any issues. Easy to use, reliable and affordable. Would happily use them again when travelling.
Rated 5 out of 5 by this reviewer
Angeline
Reliable connection. Reasonable pricing.
Rated 4 out of 5 by this reviewer
Updated
FAQs About eSIM in California
How much do eSIM California plans cost for Singapore visitors to LA?
e SIM California plans start at S$3.69 on the Verizon 5G network. HelloRoam activates via QR before your Changi departure so data is ready across the state from the moment you land. Coverage spans Los Angeles, San Francisco, San Diego, Palm Springs, and both LAX and SFO airports. No contract.
What does an e-sim California plan include for LA and San Francisco?
An e-sim California plan from HelloRoam gives you 5G speeds on Verizon across the entire state from S$3.69. Fuss-free to set up before your trip from Singapore. No physical SIM needed and no roaming fees on your Singapore number.
Which eSIM is best for Singaporeans travelling to California?
For trips to California, HelloRoam is a simple eSIM choice. Plans start from S$3.69 in SGD with access to local 4G/5G networks across 212+ carrier networks. Activate via QR code in under 2 minutes before departing from Changi Airport. Your Singtel, StarHub, or M1 number stays active through dual SIM while HelloRoam handles data abroad. You get a refund on unactivated eSIMs within 180 days and 24/7 live chat support.
How much does a California eSIM cost compared to Singtel and StarHub roaming?
A California eSIM from HelloRoam costs from S$3.69 for the full plan. Compare that to Singtel DataRoam daily passes and StarHub RoamEasy rates, which typically cost S$15 to S$30 per day. HelloRoam connects to local networks in California at local data prices, with no daily roaming surcharges and no carrier contract. All plans include local 4G/5G access with no overage charges.
Which local mobile networks does an eSIM use in California for Singapore travellers?
An eSIM for California from HelloRoam connects to local 4G/5G carrier networks. Your handphone picks the strongest available signal the moment you land. Coverage spans major cities, highways, and most rural areas. HelloRoam has direct partnerships with local networks globally, so you get data speeds comparable to a local prepaid SIM card in California.
How do I set up a HelloRoam eSIM before departing Changi Airport?
Buy your California eSIM before you leave Singapore in three steps. First, select your plan at helloroam.com and complete checkout in SGD. Second, open your handphone Settings, tap Add eSIM or Add Mobile Plan, and scan the QR code from your email. Third, your eSIM installs in under 2 minutes. Set it up the night before your flight from Changi and land connected.
Does my iPhone or Android handphone support a California eSIM?
iPhone XS and all newer models support HelloRoam eSIM in California. iPhone 13 and later models support dual eSIM, so your Singtel or StarHub line stays active for calls while HelloRoam handles travel data. For Android, Samsung Galaxy S20 and newer, Google Pixel 3 and later, and most 2019+ Android handphones support eSIM. Check your handphone Settings for an Add eSIM option to confirm compatibility.
What is the best eSIM for California for Singapore travellers?
HelloRoam is a strong choice for Singapore travellers visiting California. Plans connect on AT&T, Verizon, and T-Mobile 4G/5G networks from S$3.69 (S$ equivalent). Buy before your Changi departure, scan the QR code at home, and arrive in California already connected.
Does HelloRoam eSIM work in California?
HelloRoam eSIM works in California on AT&T, Verizon, and T-Mobile 4G/5G networks. Activate at home before your flight from Singapore. Connect the moment you clear immigration at Los Angeles International Airport without queuing for a local SIM card. Plans start from S$3.69.
Which networks does HelloRoam use in USA?
HelloRoam connects on AT&T, Verizon, and T-Mobile in USA. 4G/5G coverage is available across California and the wider region. Your phone picks the strongest signal automatically. No manual network switching is needed. Buy your plan before your Changi departure and arrive connected.
Is HelloRoam cheaper than Singtel or StarHub roaming in California?
HelloRoam eSIM for California starts at S$3.69, which is less than Singtel, StarHub, and M1 roaming charges of S$5 to S$20 per day. For a week-long trip, the savings are substantial. Buy before your Changi departure and skip the daily roaming bill entirely.
How do I activate a California eSIM from Singapore?
Purchase your plan on helloroam.com, scan the QR code in your phone Settings under Mobile Data or SIM management, and enable data when you arrive in California. The process takes about five minutes on Wi-Fi at home before your flight.
How much data do I need for a trip to California?
A week in California using Google Maps, WhatsApp, and social media typically uses 3 to 6 GB. Business travellers making video calls or streaming should choose a 10 GB plan for comfortable headroom. Singaporeans staying over 10 days often opt for the 20 GB tier.
Is there 4G/5G coverage in California?
California has 4G/5G coverage across its main districts, hotels, and tourist areas via AT&T. HelloRoam eSIM connects on the strongest available signal automatically. Buy before your flight from Changi. Connect from the moment you land at Los Angeles International Airport. No manual configuration required.
Does HelloRoam eSIM work at Los Angeles International Airport?
HelloRoam eSIM connects at Los Angeles International Airport (LAX) as soon as your phone registers on the USA network after landing. No airport Wi-Fi queue and no SIM kiosk needed. You are connected from arrivals. Activate at home in Singapore before your flight for the smoothest experience.
