eSIM vs physical SIM: what's actually different?

An eSIM does the same job as the little plastic chip in your phone. The difference is that it's already built in, and you switch it on with software.

What's the same

Both do exactly one thing: tell a mobile network "this phone is allowed on". Same job, same result — data, and in some cases calls and texts.

What's better about an eSIM

You get it instantly. No shop, no post, no airport kiosk. You buy it, and it's on your phone in a minute.

You can't lose it. There's no tray, no pin, no chip to drop. It lives in the phone.

You keep your normal SIM in. This is the big one, and it's what most people don't realise. Your usual SIM stays exactly where it is. The eSIM sits alongside it and handles your data. Your number, your calls, your texts and WhatsApp carry on completely as normal.

You can set it up before you fly. Install it on the sofa, days early. It stays dormant and springs to life when you land.

Where a physical SIM still wins

We're not going to pretend eSIMs are perfect.

• Older phones don't support them. eSIM starts around the iPhone XR/XS and Pixel 3. If your phone predates that, a physical SIM is your only option.
• You can't hand it to someone else. A physical SIM can be popped into a spare phone. An eSIM is tied to the device you installed it on.
• You need internet to install it. Which is fine if you set it up at home on wifi — but it means you can't buy one after you've landed with no signal. Sort it before you fly.

The honest summary

For travel, an eSIM is almost always the better option: it's faster, cheaper than roaming, and there's nothing to lose or swap. The one thing to check is that your phone supports it — which takes about ten seconds.

Dial *#06#. If you see an EID in the list, you're good.