eSIM or physical SIM: what to know before you switch

An eSIM does the same job as a physical SIM card, but it is built into the phone and set up digitally. Most recent iPhones and Galaxy phones support it, and some have dropped the SIM tray altogether.

How an eSIM works

Instead of putting a card in the phone, your network gives you a code or an app activation, and the phone downloads your plan. There is no card to lose, and many phones can hold more than one eSIM, so you can keep a personal and a work line on one handset, or add a travel plan abroad.

Which phones are eSIM only

The iPhone Air has no physical SIM tray, so it needs an eSIM. Most other phones we sell support a physical SIM and an eSIM together. The SIM line in the specifications on each product page tells you which applies.

Keeping your number

To move your number to a new network, ask your current network for a PAC code and give it to the new one when you sign up. Your number then transfers, usually within a working day. Do not cancel your old plan before the transfer is arranged.

Check before you order

• That your network offers eSIM for your plan. Most UK networks do, but check if you are on a business or older plan.
• That the phone supports eSIM. All the phones we sell do, but a phone you are trading in or passing on may not.
• That you have Wi-Fi when you set it up, because the plan downloads over the internet.

Our FAQ covers setup questions, and you can always ask us.