Buy Prepaid eSIM for California – Stay Connected Instantly with MobiMatter
Get an affordable eSIM for California with instant activation and seamless connectivity wherever you go.
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USA Unlimited
NextLink
3-15 days
Unlimited
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$1.80 per day
🇺🇸 United States & 🇺🇸 Hawaii
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Buy the Best eSIM for United States
From the star-studded streets of Los Angeles to the breathtaking coastal views along the Pacific Coast Highway, and the towering redwoods of Yosemite, MobiMatter’s California SIM card keeps you connected. Skip the hassle of buying a local prepaid SIM card in California and activate instantly!
Learn more about eSIM setup & eSIM activationhere
Buy the Best eSIM for United States
From the star-studded streets of Los Angeles to the breathtaking coastal views along the Pacific Coast Highway, and the towering redwoods of Yosemite, MobiMatter’s California SIM card keeps you connected. Skip the hassle of buying a local prepaid SIM card in California and activate instantly!
Learn more about eSIM setup & eSIM activationhere
Hear from our customers
5.0
This is such a good app when travelling and easy to use
MMmporima
App Store5.0
Amazing app! Using it 3 years and never had any problem. I recommend it to everyone
RRéka1209
App Store5.0
I accidentally deleted my e sim and couldn’t download it again so I talked to costumer service and they worked for like 2 hours to sort everything out for me and at the end everything worked again 100/10 service
LLolman3421
App Store5.0
I bought the eSIM for a holiday in Tibet. Everything was great; with the integrated VPN I was able to access all the sites that are normally blocked in China (Google, WhatsApp, etc.).
PPeter Paulus
Play Store5.0
If u have any issues the customer Service of this app is really fast and helpful!
GGggfcx5),(??
App Store5.0
Solved in a few minutes. It’s a really trustworthy app
PPedro Maldini
App Store5.0
I've tried so many esim apps, but MobiMatter is always the cheapest and with the best overall packages. Great customer service as well. Highly recommended!
TTorbjornhb
App Store5.0
We have been using MobiMatters for years now and we have always been fully satisfied about the offering, the service, the quality and the coverage / connectivity
RReggi55
App Store5.0
very convenient app to buy an eSim for travelling, you can choose the countries you need and have it in one pack, you can filter the options by the GB space and sort it by price, so it takes less time then just manually comparing different eSim apps. Local 5G internet works well
PPashaminin
App Store5.0
For our trip to China, South Korea, and Japan, my wife and I bought two 12GB data packages and used them without any problems. Their prices are much more reasonable compared to competitors; I definitely recommend them.
AAbdullah Gokhan Demir
Play Store5.0
So easy to use. I use it all the time when travelling abroad
FFatima A
Play Store5.0
I use it often, in various parts of the world.🌍 They always have attractive prices, and the support team responds practically immediately! Bravo! 🎉🎉 Thanks to you, my frustration doesn't escalate, and the stay is more pleasant. 😉😄
MMartyna Wu
App Store
How to get an eSIM for United States
Check Help & FAQs to see if your device supports eSIM
Choose United States as your destination and the best United States eSIM package
Checkout using secure payment methods
Instantly install your prepaid eSIM for quick and reliable connectivity.
Enjoy seamless, high-speed connectivity across United States with your online eSIM
Why MobiMatter is best for United States eSIMs?
Instant Activation
Activate your United States eSIM in minutes. Just scan, install, activate and stay connected from the moment you land.
Flexible Plans, Great Value
Choose affordable short or long-term data packages for United States - perfect for business trips, vacations, or for digital nomads. Most packages provide the option to top-up also.
Customer Support
Stay connected with peace of mind, backed by our round-the-clock customer service team. Reach out to them via the troubleshoot link.
Essential travel tips and guides for United States
Jul 22, 2026 — 11 min read
Does a UK eSIM Work in Ireland? The Ultimate Guide to Confusing eSIM Destinations
The Double-eSIM Trap Picture this. You are planning a dream trip to Italy with a day trip to the Vatican. You search "eSIM" and see Italy and Vatican City listed as two separate options. Naturally, you buy both. You have just fallen for a search engine optimization trap that costs real travelers real money every day. Many eSIM players list tiny micro-states, islands, and territories as standalone destinations purely to capture more Google search traffic, not because the coverage actually works...
Read more
Jul 15, 2026 — 8 min read
FIFA World Cup 2026 Finals Guide: Semis, Final, and Staying Connected
The World Cup 2026 semifinals are here, and they could not have set up better. France meets Spain in Texas. England meets Argentina in Georgia. Whoever survives will fly to New Jersey for the final on July 19. If you are chasing these matches across three cities, or just watching from home and planning your next trip to the States, here is what you need to know about the games, the venues, and how to actually stay online while you are there. Quick Summary The 2026 World Cup semi final stadium...
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Jun 29, 2026 — 11 min read
The Ultimate Multi-City Guide to the 2026 FIFA World Cup Knockout Stages
The 2026 FIFA World Cup runs June 11 to July 19 across 16 cities in the USA, Canada, and Mexico. Fans chasing the knockout stages will hop between Los Angeles, Miami, New York, Toronto, and Vancouver. The smartest move: grab a MobiMatter North America Regional eSIM before you fly so your data works seamlessly across all three countries, no SIM swaps, no roaming surprises. Quick Stats Before You Pack * 48 teams competing across 104 matches over 39 days * 16 host cities spanning 3 countries:...
Read more
Frequently Asked Questions
Yes, most phones that support eSIM allow dual SIM functionality. You can use your physical SIM for local calls while using your United States eSIM plan for data across United States.
Yes, you can add multiple eSIM profiles to your phone, though only one can be active at a time. Our eSIMs for United States are compatible with most devices.
Yes, our United States eSIM plans support mobile hotspot and tethering, allowing you to share your internet connection across devices while traveling in United States.