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  1. Transfer from a different smartphone: If your previous phone isn’t an Apple iPhone, contact your carrier to transfer the phone number. Activate service through a participating carrier’s app: Go to the App Store, download the carrier’s app, then use the app to activate cellular service.

  2. go to Settings > Phone and make sure My Number shows your correct mobile number; tap My Number and type in your correct number if the above steps don’t work

  3. Support. Set up iPhone. We'll show you how to set up, activate, and transfer data to your new iPhone.

    • Sareena Dayaram
    • Senior Editor
    • Contact your carrier: Your iPhone needs a physical SIM or an eSIM to connect to a cellular network. Contact your carrier to get a SIM and set up cellular service.
    • Insert the SIM card: If you have a physical SIM card, insert it into your iPhone. To do this, use a SIM eject tool or even a paperclip to open the SIM tray on the side of your device.
    • Turn on your iPhone: Press and hold the side button to turn on your iPhone (or the top button on an iPhone SE). Follow the on-screen prompts to set up your iPhone.
    • Activate your SIM card: If you have an eSIM, you can activate it during setup. If you have a physical SIM card, you may need to activate it by following the instructions provided by your carrier.
  4. To move your mobile number across to your new SIM, sign in to My O2. If you're an O2 Business customer, please sign in to My O2 Business to swap your SIM. SIM swaps can take up to 24 hours to complete.

  5. If you're switching to iPhone (from an Android phone, for example), contact your network provider to transfer your phone number to your iPhone through eSIM Carrier Activation or by scanning a QR code from your network provider.

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  7. Nov 23, 2021 · If you're setting up a new or used iPhone, you'll need to activate your iPhone with a cellular service provider. Activating your iPhone will involve inserting a SIM card into it and...