eSIM vs physical SIM: which should you choose?

Key takeaways

• An eSIM is built into your phone and set up using a QR code. A physical SIM is a card you insert into the SIM tray. Neither is better for everyone, as the plan works the same on both.
• Choose an eSIM if you want to start in minutes, switch networks without waiting for the post, or run two numbers on one phone.
• Choose a physical SIM if you prefer to swap phones manually, your phone doesn't support eSIM, or you want a backup you can move in an emergency.

 

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Checkout asks a question you've probably never thought about: eSIM or SIM card?

Your plan works the same on either. The difference is in the everyday bits, like how you start, how you switch phones and what happens if yours goes missing.

Here's how the two compare, and how to choose.

What's the difference between an eSIM and a physical SIM?

A physical SIM is a small plastic card that fits into your phone's SIM tray. It comes in three sizes, as explained in our guide to what a SIM card is.

An eSIM is built into your phone. Instead of a card, your network sends you a QR code or activation details, and you set it up on screen.

Here's how they differ day to day:

	eSIM	Physical SIM
Getting started	Set up on screen in minutes, with no card to wait for.	Needs a card to be posted or collected, then inserted.
Switching network	Done on your phone, with no card involved.	Needs a new card from the new network.
Moving to a new phone	Needs a transfer or a new QR code from your network.	Move the card across, as long as it fits the new phone's tray.
If your phone breaks	Your network has to set up a new eSIM before another phone can use your number.	Put the card in another compatible phone.
Lost or stolen phone	Can't be taken out and used in another phone.	Can be taken out and used elsewhere unless a SIM PIN is set.
Phone compatibility	Needs a phone that supports eSIM. Our list of eSIM-compatible phones will tell you.	Works in phones with a SIM tray.
Two numbers on one phone	Many phones let an eSIM sit alongside a physical SIM.	Needs a phone with two SIM trays, or a second phone.

eSIM pros and cons: who is it best for?

An eSIM tends to suit you if:

• You want to get going straight away. An eSIM can be set up in minutes, with no card to wait for.
• You switch networks or plans now and then. A new eSIM is set up on your phone, so nothing needs posting.
• You want two numbers on one phone. Many phones let an eSIM sit alongside a physical SIM, which is handy for keeping work and personal calls apart. Our guide to how many eSIMs you can have explains the limits.
• You worry about a stolen phone. An eSIM can't be taken out and used in another phone. It won't stop a scammer tricking a network into moving your number. A strong passcode still matters.

The catch: moving an eSIM to a new phone needs a transfer or a new QR code, and you can't hand it over if your phone breaks.

Physical SIM pros and cons: who is it best for?

A physical SIM tends to suit you if:

• You like swapping SIMs between phones. Pop the card out and put it in another phone, which is handy if you keep a spare.
• Your phone doesn't support eSIM. Many older phones only take a physical SIM, and that's all right.
• You want a simple fallback if your phone breaks. The card can go into another compatible phone without contacting your network first.
• You prefer the familiar way. Put the card in, and you're connected, with no QR codes or settings menus.

The catch: a card must arrive by post before you can start, and it can be used in another phone unless you set a SIM PIN.

Which should you choose?

Find the lines below that sound like you.

If this sounds like you	Then consider
Your phone doesn't support eSIM.	A physical SIM, because it's the only option your phone offers.
You want to start today.	An eSIM, because there's no card to wait for.
You swap phones often or keep a spare.	A physical SIM, because you can move the card by hand.
You want two numbers on one phone.	An eSIM alongside a physical SIM, if your phone supports both.
You'd like a stolen phone's SIM to be useless to a thief.	An eSIM, or a physical SIM with a SIM PIN set.

Choosing between an eSIM and a SIM with SMARTY

SMARTY offers both options. Pick your plan first, then choose a physical SIM or an eSIM at checkout.

Already decided? Browse all SMARTY plans. Want to know how our eSIM works? Visit our eSIM page.

FAQs

Is an eSIM better than a physical SIM?

Neither is better for everyone. An eSIM is quicker to set up and can't be removed from a stolen phone, while a physical SIM is easier to transfer between phones by hand.

Can I switch from a physical SIM to an eSIM, or back again?

Yes, in most cases. Switching works as long as the phone supports eSIM and the network offers it. With SMARTY, go to Account settings, then Manage plan, then Replace SIM, and choose the SIM type you want.

Is signal better on an eSIM or a physical SIM?

Neither changes the network you connect to, so signal quality depends on the network and your location. Check coverage in the places you use your phone most before you pick a plan.