How to activate a micro SIM

Written by michael roennevig Google
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How to activate a micro SIM
Hold onto your old card until your new one is activated. (George Doyle & Ciaran Griffin/Stockbyte/Getty Images)

You may find your bulky old traditional SIM card won't fit in your shiny new smartphone. If this is the case, the carrier you bought your new device from will send you a micro SIM. If you want to port an existing number or service over to your new SIM, you'll need to submit an activation request to your network provider. In most cases, your micro SIM should be ready to go in less than a day.

Skill level:


  1. 1

    Insert your new micro SIM into your phone. If you've just signed up for a new contract or bought a pay-as-you-go handset, your SIM should be ready to go out of the box, so it will just be a question of turning your device on and setting it up. Check your handset's user guide for advice on how to do this. You may need to add credit to your phone if it's PAYG, but most networks and resellers provide some calling time with non-contract deals. Contact your old carrier for a Porting Authorisation Code if you want to transfer an existing number to your new SIM.

  2. 2

    Ask your network provider to activate your micro SIM if you've upgraded from a device that ran off a standard card. Your old number will then be ported over to your new micro SIM. Most carriers allow their customers to do this using an online form. You'll typically also need to complete an online form if you're porting an existing number from another network provider to your new micro SIM. You may need to register for an account with your new network provider before you can submit a activation request.

  3. 3

    Carry on using your old SIM until your number or service is transferred. If you've upgraded to a new device, keep both phones on to monitor when the switch takes place. Most carriers advise it can take up to 24 hours to port a number. You may need to restart your micro SIM device after you've submitted your activation request. If your micro SIM isn't activated in the time frame quoted by your network provider, contact its customer service department.

Tips and warnings

  • Use a micro SIM adapter to get data of your old device, provided your old phone isn't locked to another network.

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