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.
103 products
USA Unlimited
NextLink
3-15 days
Unlimited
Starting from
$1.80 per day
🇺🇸 United States & 🇺🇸 Hawaii
MobiMatter Rewards
EXCLUSIVE
Get up to $5 for every friend referred
MobiMatter Rewards
EXCLUSIVE
Get 10% cashback with every purchase
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
"Great app. I recommend it. It works flawlessly for Turkey."
Translated from Turkish
GGilgaxtrem
App Store5.0
It's the most easiest simplest way of taking data with you. A quick flick of the sim button and that's it. Highly recommended.
EEfy Din
Play Store5.0
I would definitely recommend this service because it offers the most affordable prices, has a seamless connection, and a support team that provides immediate assistance with even the smallest issues. I continue to use it with pleasure.
AAhmet gençer
Play Store5.0
"I have been using it in every country I have visited for years and have never had any problems. The prices are always very reasonable."
Translated from Turkish
DDidemkrdnz
App Store5.0
This is such a good app when travelling and easy to use
MMmporima
App Store5.0
⭐⭐⭐⭐⭐ Excellent customer support! I had an issue with my eSIM connection, and the support team resolved it quickly and professionally. They were patient, responsive, and very helpful throughout the process. Everything is working perfectly now. Highly recommended. Thank you, MobiMatter!
AAli Ceceli
Play Store5.0
Great, quick and profesional support! Thank you guys! ❤️
TTiki_sa
App Store5.0
I bought two esims for two different countries because mobimatter has affordable prices. I had an issue connecting the second esim. The helpdesk responded fast. It turns out I was using the first eSIM instead of the second. Thanks for good data in both countries and for responding fast!
SStylus86
App Store5.0
Using this service more than 2 years and very happy with it! Recommending it for anyone!
DDush@m
App Store5.0
I have been using it for about 2 years and I am very satisfied. I used it in Greece, Bulgaria, and Romania, and I experienced internet speeds that I haven't seen in Turkey.
Translated from Turkish
SSebahattin Akbulut
App Store5.0
Good connection in multiple countries I've visited. Helpful support team responding to problems and solving them in just a few minutes. Best ratio of price to size of data packages I've managed to find online
MMateusz Martenka
Play Store5.0
Always works for me in many countries and has competitive prices!
TTorontoPoutine
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...
Read more
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.