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  1. If you don’t have your current SIM, or it’s no longer working, either put the new plastic SIM into your device or download the new eSIM profile to your device. If your device connects to our network, you can start using your new SIM straightaway.

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  2. Here’s what to do when you get sent a new SIM: pop the SIM into your device. activate your new SIM - you only need to do this if you’ve upgraded and been sent a new SIM, or ordered a new one because your old one no longer fitted your device.

  3. Activating your device or SIM. To activate your SIM you just need to insert it into your phone and make a call to any number. Because we send you a Tri-SIM, you’ll never need to worry about getting the wrong size. If you need to activate an eSIM, please take a look at our eSIM page for more support.

  4. If you don’t want to be on our No-contract SIM tariff, you can move to our Triple Credit tariff in My Account, in our app or by calling 282 free from your Tesco Mobile phone.

  5. Jul 28, 2023 · In many cases, you simply need to insert your new SIM card into your phone to activate it. Otherwise, if you need to enter a particular code (found on your new SIM card), you can do so online via the network’s website or app. To make it easy, we’ve broken down how to activate a SIM card by network. Read on and we’ll explain all.

  6. Nov 3, 2023 · In most cases you need your new SIM Only contract to be active before you port your number, which means that the first step is typically to order a new SIM card and then activate it when it arrives. This card will come with a phone number of its own – but don’t worry, it’s only temporary.

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  8. You'll need your temporary Three number and the 19-digit Sim number (ICCID), which you'll find on the Sim card pack itself. Once submitted, it'll be activated within a couple of hours. If you want to keep your number, you can enter the phone number you wish to keep and your PAC on its switching page and Three will switch it within one working day.