There are 3 SIM sizes available: Standard, Micro, and Nano. We send out a Trio SIM giving you the choice of all 3 sizes – just press out the one you need.
Not sure which size you need? You can check on our device support page.
SIM support
This is where you can find everything you need to know about your Three SIM. From getting a replacement and activating it to using dual SIM devices and what to do if your SIM’s lost or stolen.
Need help with an eSIM? Head to our eSIM support page.
Activating your replacement SIM
Your new SIM will be active and ready to use straight away. All you need to do is put it into your device. It’ll connect to our network automatically – when you see signal bars, you’re ready to go.
Can’t see any signal bars? You might need to turn off Wi-Fi in your device settings for them to show.
Still having trouble? Here’s how to activate your SIM manually:
- Log into My3
- Go to Plan
- Then SIM not activated
- Select Activate SIM
- Then follow the on-screen steps
More SIM support
Lost or stolen SIM
Please let us know of any lost or stolen SIMs as soon as possible so we can protect your account.
Just upgraded?
Here’s everything you need to know about using your SIM after upgrading with us.
How to get a replacement SIM
You can order a replacement SIM by logging into My3, going to Plan, then Replace SIM.
Using a Dual SIM device
Dual SIM devices let you use 1 different SIMs in 1 device
Perfect for travelling – you can have a dedicated travel SIM, ready whenever you need it.
Or use your secondary SIM as a backup in areas of low coverage.
Frequently asked questions
SIM too small? A SIM adaptor can help.
Check what size SIM you need then put your SIM into the adaptor. It can then go into your device SIM slot. And that’s it.
eSIMs are virtual SIMs used by most of the latest devices. They’re quick and easy to set up. And with no plastic, packaging or postage, they’re a greener choice too.
Pair your smartwatch with your phone, put the power on your wrist and stay connected.