Will I have signal on Pacific Coast Highway?

In towns like Monterey, Santa Barbara and San Luis Obispo, yes. Between them, especially around Big Sur, coverage drops for long stretches, so save offline maps and playlists before setting off.

Which network will my eSIM use in California?

It roams onto a major US carrier - AT&T, T-Mobile or Verizon - depending on location. Coverage is excellent across cities and suburbs, and thinner in remote national parks and high mountain passes.

California eSIM.

Name: California travel eSIM
Brand: My Holiday SIM

From Big Sur cliffs to Yosemite granite and the neon Sunset Strip - one plan, the whole Golden State.

from $3.12/day · unlimited dataAll of USA →

Unlimited data5G where availableInstant QR by emailKeep your number

1 · How many days?

10 daysOther:days

2 · How much data?

3GBBest pricevalid 15 days$8.24$0.82/day

Cheapest plan covering your trip: 3GB, valid 15 days.

Travellers (one eSIM each)

1 × 3GB (valid 15 days) · 10-day trip$8.24

Good to know in California

If you're driving Highway 1 or into Yosemite, download offline Google Maps for the whole route while you still have city signal - long coastal and mountain stretches drop to no bars for miles.

Best time to visit California

Spring and autumn bring warm, dry days statewide; summer suits the coast and mountains, while deserts like Death Valley are gentler in winter.

Two simple ways to buy

California eSIM plans: unlimited, or by the GB.

Every California eSIM from My Holiday SIM is one of two straightforward types. Pick whichever fits how you travel in California — you can always top up or switch on your next trip.

Traveller streaming and browsing freely on an unlimited-data travel eSIM

Unlimited plans

High-speed data, nothing to count

Priced per day — the longer you stay, the better the daily rate. Ideal for streaming, hotspot and longer trips where you'd rather not watch a data meter. A fair-use policy keeps speeds fast for everyone; see each plan for the detail.

Best for streaming, video calls & hotspot
Great for longer or open-ended trips
One price per day — no GB anxiety

By-the-GB plans

3GB10GB20GB

A set bundle, brilliant value

A fixed data allowance (say 3 GB or 10 GB) valid for your travel days. The best-value pick for lighter trips built around maps, messaging and a bit of browsing. Running low? Top up in a couple of taps — nothing to reinstall.

Best value for lighter, shorter trips
Clear allowance — pay only for what you need
Top up any time from your phone

Compare plans →Not every destination has both types — the picker shows what's available where you're headed.

Plan your data

How much data do you need in California?

A rough, honest guide to sizing your California eSIM so you're not guessing. Most travellers in California are comfortable on 3–5 GB a week — heavy streamers just go Unlimited.

Traveller checking maps and messages on her phone using a My Holiday SIM eSIM

Not sure? Start with a 5 GB plan — you can top up in seconds if you run low.

Light

~1 GB / week

Maps, messaging & email

Google Maps, WhatsApp, email and the odd search. Plenty for a city break where you mostly need directions.

Suits 1–3 GB plans

Balanced

3–5 GB / week

Everyday holiday use

Everything above plus social scrolling, music, cloud photo backups and a little video. Where most travellers land.

Suits 5–10 GB plans

California eSIM: your local data guide.

California packs Pacific Coast Highway road trips, Yosemite's granite domes, Napa vineyards and Disneyland into one enormous state, and you'll want live maps for every mile. A California eSIM keeps Google Maps, surf reports and restaurant bookings running from San Diego beaches to Lake Tahoe ski lifts without hunting for hotel Wi-Fi.

One eSIM for California and all of USA. It's the national USA eSIM — from $3.12/day with unlimited data, working the same in California as it does the moment you leave it.

Landing at Los Angeles International (LAX)?

Install the QR at home, then switch the eSIM on as you taxi in — you're online before you reach the arrivals hall.

California eSIM pricingbest-value plan · per day

Days

Per day

Total

Saving

3 days1GB

$1.05

$3.14

—

5 days1GB

$0.63

$3.14

−40%

7 days1GB

$0.45

$3.14

−57%

10 days3GBPopular

$0.82

$8.24

−22%

15 days3GB

$0.55

$8.24

−48%

30 days5GB

$0.37

$10.98

−65%

Each trip length shows the best-value plan that covers it. Total always shown before you pay.

eSIM vs the old ways in California

eSIM

ROAMING

AIRPORT SIM

Data allowance

Unlimited

Usually capped

Rarely unlimited

Price known upfront

Prepaid

Billed after

Varies at the desk

Ready when you land

Instantly

After the queue

Keep WhatsApp number

SIM swapped

California eSIM from $3.12/day — the whole bill, agreed before you fly.

Across the region

Where you'll lean on data in California.

Yosemite National Park

Coverage fades among the granite walls and valley floor, so download offline maps before you leave the gateway towns.

Big Sur

Signal along Highway 1 is patchy between Carmel and San Simeon, so lean on data in Monterey before the cliffs.

Napa Valley

4G is reliable across the vineyard towns for winery bookings and rideshare between tastings.

Lake Tahoe

Strong data around the resorts and lake shore, thinner on backcountry trails and higher mountain passes.

The practical bit

Getting around California on your eSIM.

Apps you'll want online in California

Uber— The main ride-hailing app statewide, from LAX pickups to late-night rides in San Francisco.
Lyft— Widely used US rideshare alternative, handy when Uber surges in busy cities.
BART— Official app for Bay Area Rapid Transit trains linking SFO, Oakland and downtown San Francisco.
Transit— Live bus and metro times for LA Metro, San Diego and the Bay Area systems.

How long to stay in California

Most visitors spend 7-14 days, often pairing a city like LA or San Francisco with a coastal drive and a national park or two.

How much data for California

A balanced 3-5 GB covers maps, bookings and social sharing for a week; choose Unlimited if you'll stream on long drives or tether a laptop while working on the road.

Coverage in California

5G is strong across LA, the Bay Area and San Diego; expect 4G in smaller towns and real dead zones in Yosemite, along Big Sur and over high Sierra passes.

Where you're headed

Discover California.

Street sign for California with traffic light in cityscape. Urban navigation and signage theme.

Street sign for California in an urban environment, highlighting city life.

Street sign of California in an urban landscape featuring tall buildings and a traffic light.

American and California flags waving against a palm tree backdrop in sunny Monterey, CA.

Cities in California

Zoom in on California.

Los Angeles eSIM San Francisco eSIM

How to activate your California eSIM.

Full installation guide →

A traveller happily planning her next trip with a map and phone

Buy your plan

Choose your days — the QR code arrives by email in seconds.

A traveller installing her eSIM from the sofa in two minutes

Install at home

Scan the QR on Wi-Fi before you fly. About two minutes, no app needed.

Friends laughing together while packing for a holiday

Fly relaxed

Nothing counts down yet — your days start only at first connection.

A joyful family reunion at the airport arrivals hall

Switch on in California

Turn the line on when you land. Connected before baggage claim.

New to eSIM in California?

What is a California eSIM?

A California eSIM is a digital SIM that's already built into your phone. Scan one QR code and a local California data plan installs alongside your home SIM — no plastic, no tray tool, no swap. Your number and WhatsApp stay exactly where they are.

✓ 2-minute install✓ Keep your number✓ Works on phones from 2018+

How eSIM works →Check my phone

A traveller with a backpack smiling at her phone — online abroad with My Holiday SIM

Connected · 5G

Home SIM · calls & WhatsAppHoliday eSIM · unlimited data

30-day refund promiseUnused, uninstalled eSIM? Full refund, no questions.

The price is the billPrepaid and final — roaming charges can't happen.

Days start when you landInstall early with zero pressure; counting begins at first connection.

Humans, 24/7Real people answer, before, during and after the trip.

Why travellers choose My Holiday SIM for California.

Instant eSIM deliveryQR code in your inbox seconds after checkout — even at the departure gate.

No physical SIMNothing to collect, lose or poke out with a paperclip. Your home SIM stays put.

Keep your WhatsApp numberData flows through us; WhatsApp stays on your home number. Family always reaches you.

A traveller at the departure gate, eSIM ready on her phone

eSIM ready in ~2 minutes

No bill shock, everOne clear price before you fly. Roaming charges simply can't happen.

Secure paymentsCards, Apple Pay, Google Pay, PayPal and Klarna — encrypted end to end.

Real human supportReal people — before, during and after your trip. Live chat and email, no bots. Easy top-ups too.

Coverage in USA.

5G where available, fast 4G everywhere else

Connected · 5G

Your eSIM joins USA's partner networks automatically — no settings to choose, no manual network hunting. If signal drops in a remote spot, toggling Airplane Mode for a few seconds forces a fresh connection.

AT&T
T-Mobile
Verizon

Popular places covered

New YorkLos AngelesMiamiLas VegasSan FranciscoOrlandoChicagoWashington DC

Keep data roaming ON for the eSIM line only — that's the switch travel eSIMs use, and it never adds charges on our plans.

Trusted networks, honest numbers.

No invented star ratings behind your California eSIM — just the numbers we actually stand behind.

Friendly globe with location pins — coverage on every continent

My Holiday SIMSTAY CONNECTED. ANYWHERE.

200+

destinations — every continent covered

regions covered by a single regional eSIM

~2 min

typical install — QR to connected

Live

chat & email support

Before you fly

California eSIM questions, answered.

Yes. It's the single national USA plan, so the same eSIM runs from Los Angeles to San Francisco, the deserts and the Sierra Nevada, and keeps working if you cross into Nevada or Arizona on a road trip.

Your California eSIM glossary.

eSIMA SIM built into your phone's hardware. Plans install onto it digitally — no plastic card involved.

QR profileThe code we email you. Scanning it downloads your holiday plan onto the eSIM. One scan per device.

Data roaming (the switch)The toggle travel eSIMs use to join partner networks abroad. On our plans it never adds charges — keep it ON for the eSIM, OFF for your home SIM.

Hotspot / tetheringSharing your phone's data with laptops and tablets. Included on our plans wherever networks allow.

Top-upExtra days added to a live plan from your account. They append to the end — nothing overlaps.

First connectionThe moment your eSIM first joins a network at the destination — that's when your days start counting, not before.

Travelling wider in USA?