What is eSIM? How to set it up on iPhone and Android

An eSIM is a SIM card built into your phone. Instead of putting a plastic card in a tray, you download your carrier plan. It does the same job: your number, your plan and your carrier.

In the US, iPhones have been eSIM-only since the iPhone 14, and new phones like the iPhone Duo are eSIM-only too. Most recent Android phones support both.

Why it’s (mostly) better

• Faster setup: you can activate a plan without visiting a store.
• Safer if your phone is stolen: a thief can’t just pop out the SIM.
• Two numbers on one phone: keep a work line and a personal line, or add a travel plan without removing your own.

The downside: moving your number to a new phone depends on your carrier supporting it, and switching an eSIM to an Android phone isn’t always as quick as moving a card.

Set up eSIM on iPhone

Apple lists several ways (Apple Support):

eSIM Quick Transfer (from your old iPhone)

1. On the new iPhone: Settings > Cellular > Set Up Cellular or Add eSIM.
2. Choose the plan to transfer, or tap Transfer From Nearby iPhone.
3. On the old iPhone, confirm with Transfer or enter the code shown.
4. Wait for activation. The old phone’s SIM stops working once the new one activates.

eSIM Carrier Activation If your carrier set up the plan when you bought the phone, you’ll see “Carrier Cellular Plan Ready to Be Installed.” Tap it, then Continue, then make a test call.

QR code from your carrier Open the Camera, scan the code and tap Cellular Plan Detected. On iOS 17.4 and later you can also touch and hold a QR code in an email and tap Add eSIM.

Set up eSIM on Android

On a Pixel and most Android phones, start in Settings > Network & internet > SIMs and choose to add or download a SIM. Your carrier’s app or a QR code does the rest. On Samsung Galaxy, look under Connections > SIM manager. When you move from another phone, setup often offers to bring your eSIM across if your carrier supports it.

Traveling abroad

Instead of paying daily roaming, you can add a local or travel eSIM and keep your US number for calls and texts:

1. Buy the travel eSIM before you leave and install it at home on Wi-Fi.
2. Turn it on as your data line when you land.
3. Make sure your phone is unlocked; carrier-locked phones may refuse another carrier’s eSIM.

If something goes wrong

• No service after the transfer: restart the phone, then call your carrier from another phone or chat with them online.
• Selling or giving away an old phone: remove the eSIM from it first, in its Cellular or SIM settings.

Our take

eSIM is one of those changes that feels scary for a day and then you forget about it. Before you switch phones, make sure your carrier’s app works and you know your account PIN. That’s what you’ll need if the transfer stalls.

Prices checked on 2026-10-23.

Sources

• Official Apple Support: Set up eSIM on iPhone (checked Oct 23, 2026)
• Official Apple: What is eSIM on iPhone?