Nano SIM, micro SIM and standard SIM: the sizes explained
A SIM card comes in three physical sizes. All three work the same way. The only difference is how big the plastic is.
The three sizes
| Name | Approximate size |
|---|---|
| Standard (mini) SIM | 25 x 15 mm |
| Micro SIM | 15 x 12 mm |
| Nano SIM | 12.3 x 8.8 mm |
Nano SIM is the size used by almost all current phones. Standard and micro SIMs belong to older phones.
How to know which one your phone uses
- Check the specs: look for “SIM type” or “Nano-SIM”. See how to read a phone spec sheet.
- Look at the SIM tray: the shape of the slot shows the size.
- Ask the operator or a retailer when you buy the SIM. Most operators give a SIM with all three shapes punched into one card.
Please do not cut a SIM yourself
Cutting a SIM to a smaller size can damage the chip and may leave it too thin, so it can jam in the slot. Ask your operator for a replacement SIM in the right size. This is safer and usually quick.
Adapters
An adapter lets a smaller SIM sit in a larger slot. Never use one to put a small SIM into a smaller phone slot: a loose adapter can get stuck.
Dual SIM, hybrid slot and memory card
- Dual SIM phones have two slots, or a single tray holding two SIMs.
- Hybrid slot: the second slot is shared. You use either a second SIM or a memory card, not both.
- Check this if you want two SIMs and extra storage.
eSIM
Some phones also have an eSIM, a SIM built into the phone that is set up through software. If you want one, check with your operator whether it is offered and which phones it supports.
If the SIM is not detected
Switch off, take the tray out, wipe the SIM, put it back and switch on. If that does not help, see how to fix mobile data not working. When buying a used phone, check the SIM slots work: see buying a used phone.
