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What do to with your SIM

Understanding SIM Cards for New SIM only customers / Replacement SIMs / Pay as you go SIMS

We’ll send you a Tri-SIM which contains all three SIM sizes available.

Check your new phone carefully to see which size you need to pop out. You can also check the phone instructions or look at your phone’s device guide for step-by-step instructions.

You’ll need to pop out the right sized SIM for your phone from the plastic card. On the back of your card you’ll see your mobile number and SIM serial number.

If you pop out the wrong sized SIM then you’ll need to contact us to get a replacement. If you’re a business customer, please contact us.

Your SIM will usually need to be inserted into the removable SIM tray or under the battery. If you need help with this, our device guides give you step-by-step instructions.

New phone


Your SIM will be on the side of your new phone’s box, so you’ll need to insert it into your new phone. To see how to do this, check our device guides.

Upgrading your phone


If you let us know you needed a new SIM when you upgraded, it will be on the side of your new phone’s box, so you’ll need to insert it into your new phone. To see how to do this, check our device guides.

You’ll also need to switch your number to your new SIM. Whilst your number is switching over, this SIM may show as a Tesco Mobile pay as you go SIM card. This is normal and will change when your number has transferred.

If you didn’t need a new SIM because your old phone and new phone take the same size SIM, simply put your old SIM into your new phone and use it as normal.

Problems with your SIM?


If you need further help, our social media team are also here to help. You can get in touch with them on Facebook and Twitter