How to Set Up eSIM on iPhone: eSIM & Mobile Connectivity Explained

In one sentence

Setting up an eSIM on iPhone means adding a mobile data plan to your phone digitally, with no physical SIM card, usually by tapping one install button in the email your provider sends you.

In detail

An eSIM is a SIM built into your iPhone, so a new plan is installed as a download instead of a plastic card. With Fresim plans, the delivery email includes an Install on iPhone button for iOS 17.4 and later. You tap it, follow the prompts, and the eSIM installs. A QR code is also included, which is handy for sharing the eSIM or installing it from another screen, such as a laptop. iPhones from the XS and XR (2018) onwards support eSIM, and your iPhone must be carrier-unlocked to accept a plan from a different provider. Because the eSIM sits alongside your normal SIM, you can keep your home number for calls and texts while using the travel plan for data.

How it works

When you tap Install on iPhone, iOS reads a small activation profile from the link and asks you to confirm adding a new mobile plan, which needs an internet connection such as Wi-Fi. Your iPhone then stores the eSIM profile in a secure chip and lists it as a new line under Settings > Mobile Service (called Cellular in some regions). You choose which line is used for data and turn on Data Roaming for the travel eSIM so it can connect to local networks at your destination.

Why travellers should care

Installing before you fly means you land with data already set up, so you can book a ride, load maps or message family without hunting for a SIM shop or airport Wi-Fi. Many travellers install the eSIM at home on Wi-Fi, then switch it on when they arrive. Plans are sold per destination, and prices vary by destination and are set by each store, so compare options before you buy.

Related terms

• iOS eSIM
• iPhone 14+ eSIM-only
• carrier plan
• eSIM QR code
• Data roaming

Example

Priya is flying from Sydney to Tokyo on an iPhone 15 running iOS 18. A week before departure she buys a Japan eSIM from a creator's Fresim store, opens the delivery email on her phone, and taps Install on iPhone. Over home Wi-Fi she follows the prompts and labels the new line Japan Data. Her main SIM stays on for her Australian number. On landing she sets Japan Data as the line for mobile data, switches Data Roaming on for that line, and is online before reaching immigration. Her partner, on another phone, scans the QR code from Priya's laptop screen to install their own eSIM.

Key takeaway

Check that your iPhone is unlocked and on iOS 17.4 or later, tap Install on iPhone in your delivery email while on Wi-Fi, then turn on Data Roaming for the new line when you arrive.