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An eSIM for California from HelloRoam starts at S$3.69 as a full plan, with access to 199+ carrier networks across 185+ countries. Activate via QR code in under two minutes on any eSIM compatible phone. Keep your Singtel, StarHub, or M1 number active on dual SIM.
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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 AT&T and Verizon 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 AT&T 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
Select a data plan for your destination and complete checkout.
Scan the QR code to install your eSIM straight away.
Your eSIM installs instantly and activates when you land.
Track usage, top up data, and manage all your eSIMs in one place.
Select a data plan for your destination and complete checkout.
Scan the QR code to install your eSIM straight away.
Your eSIM installs instantly and activates when you land.
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 for your 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 180-day refund on unactivated eSIMs.
| Feature |  | Local provider | Limited data eSIM |
|---|---|---|---|
| 180-day refund (unactivated eSIMs) |  |  | |
| 24/7 live chat support | |  | |
| $0 activation fees | | | |
| Automatic data alerts at 80% usage | | | |
| No data overage charges | | | |
| Instant QR code delivery | | | |
| Premium California carrier networks | | | |
Why Singaporean Travellers Choose an e SIM for California
HelloRoam vs Other eSIM Providers for California
See how HelloRoam compares to Airalo, Holafly, and other eSIM providers for California travel. Singaporean travellers choose HelloRoam for the industry-leading purchase protection guarantee, 24/7 live chat support, and competitive pricing from S$3.69.
| Feature comparison | | Airalo | Holafly | Nomad | Saily | Ubigi |
|---|---|---|---|---|---|---|
| 180-day refund (unactivated eSIMs) | | | | | | |
| 24/7 live chat support | | | | | | |
| A$0 activation fees | | | | | | |
| Automatic data alerts at 80% usage | | | | | | |
| No data overage charges | | | | | | |
| Instant QR code delivery | | | | | | |
| Premium California carrier networks | | | | | | |
| Own branded carrier identity (SPN) | | | | | | |
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 AT&T 5G, Verizon 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.
- AT&T
- 5G
- Verizon
- 5G
HelloRoam eSIM vs Singtel, StarHub, or M1 roaming in California
Your data options for a California trip from Singapore.
RecommendedFrom SGD 3.69 total
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.
SGD 6.42–SGD 32.12 total
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.
SGD 6.42–SGD 19.27/day
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.
| Category | 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. |
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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Prices verified for 2026
FAQs About eSIM in California
e SIM California plans start at S$3.69 on the AT&T 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.
An e-sim California plan from HelloRoam gives you 5G speeds on AT&T 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.
For Singaporean travellers heading to California in 2026, HelloRoam is the top-rated eSIM choice. Plans start from S$3.69 in SGD with access to local 4G/5G networks across a wide carrier partnership spanning 185+ countries. 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 180-day refund on unactivated eSIMs and 24/7 live chat support.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
