eSIMs explained

What an eSIM is

An eSIM is a SIM built into your phone rather than a plastic card you slot in. Instead of swapping a chip, you activate a plan by scanning a QR code or tapping through an app. The hardware stays put; the network details are loaded digitally.

Why people like them

• Instant setup. Activate a new plan in minutes without waiting for a SIM to arrive in the post.
• Dual SIM made easy. Run a personal and a work number, or a UK and a travel plan, on one phone at the same time.
• Great for travel. Add a local or regional data plan abroad without removing your home SIM, avoiding roaming charges.
• Nothing to lose. No tiny card to misplace, and harder for a thief to remove and reuse.

Which phones support eSIM?

Most recent iPhones, Samsung Galaxy and Google Pixel handsets support eSIM, often alongside a physical SIM slot. Some newer models are eSIM-only. Check your phone's settings for an "Add eSIM" or "Add mobile plan" option, or your manufacturer's specs if you are unsure.

Switching to or with an eSIM

Moving networks with an eSIM is quick: the new provider sends a QR code and you are live in minutes, no posted SIM required. If you change phone, you transfer the eSIM digitally rather than moving a card. Plenty of SIM-only plans now offer an eSIM option at no extra cost.

Anything to watch?

Transferring an eSIM to a brand-new handset can occasionally need a quick step with your provider. And because it is tied to the device, make sure you can re-download the profile before you factory reset or sell a phone. These are minor points against the convenience.

The bottom line

An eSIM does everything a plastic SIM does, faster and more flexibly, and it shines for dual-SIM and travel. If your phone supports it, there is little reason not to use one. Look for an eSIM option when you next compare SIM-only deals.