Have you put in your O2 Pay as you go or Pay monthly SIM card on your mobile device but it wont activate after 24 hours? Does the same issue happen after you changed your cellphone and got the replacement SIM from O2 and your finding no matter what you do your O2 sim wont activate?

Sometimes, you may need a put in a new SIM with a different size after changing your mobile device. However, quite a few users report that when they get a new SIM from O2 and put it in the new phone, they can’t receive calls, text messages, or use mobile data.

Furthermore, the old SIM kept on working on the old cellphone. Therefore, users have been carrying two phones at a time, hoping for a switch that might take any tim56e. However, they have been waiting for over a day, but the new O2 SIM on the new phone won’t activate. Let’s dig into the detail and work out a solution for this issue.

Do I have to activate my 02 SIM card?

Do I have to activate my 02 SIM card?

If you are a Pay Monthly O2 customer and have a plastic O2 SIM, put in the SIM on your cellphone, and you are good to go. The same goes for Pay As You Go customers, but you need to top up to activate your 02 SIM.

However, if you are an O2 customer and have upgraded to a phone that needs a different SIM, O2 will send a new SIM to you. Afterward, you have to activate the replacement SIM with the swap process to keep your existing cellphone number and contacts.

Furthermore, eSIM Pay Monthly O2 users also need to activate their SIM cards if they don’t have a current SIM or the SIM is no longer working.

How long does it take for O2 SIM to activate?

How long does it take for O2 SIM to activate?

Users who got a new or replacement eSIM need to download the eSIM profile on their new device by using the QR codes that come with the eSIM pack. If the device connects to the O2 network, you can use the new SIM straightaway. Otherwise, contact 02 support for identity confirmation if eSIM activation fails.

Now, if you got a new cellphone that requires a different size SIM to be used with it or you need an O2 SIM with a 4G tariff, then you need to wait for the 02 to send you a new SIM. Afterward, swap the numbers of your old SIM to the new one by going to your My O2 Business account. Next, wait for 24 hours for the SIM activation.

How do I activate my O2 SIM?

How do I activate my O2 SIM?

Many O2 users couldn’t get their replacement SIM activated after waiting for 24 hours. Most of the time, the issue happens by following the incorrect activation or swapping process. Let’s find out how to do it properly.

O2 sends you the replacement SIM with three size options, i.e., Standard, Micro, and Nano. You can break out the SIM size of your choice for the new device by referring to the details mentioned on the card. However, if you break out the wrong size, you must ask O2 for another replacement SIM.

The Pay Monthly new replacement SIM card is blank, and there is no number attached to it. Therefore, you need to swap and activate it. If your old SIM fits the new cellphone, sometimes, there is no need to do the SIM swap process.

How do I swap my O2 SIM card?

To do the SIM swap, you have the following options.

  • Grab your old phone with the old O2 SIM and text the word SWAP. Now send the text to 20220. Next, you will receive step-by-step instructions via a text message from O2.
  • Another method to activate the replacement SIM is from your “My 02 Business”. Once signed in, find the “Swap your SIM” option under your account. Next, Re-enter your O2 credentials and confirm a verification code sent on your old SIM. Afterward, enter the new O2 SIM information and wait for 24 hours.
  • A local O2 store can also swap the SIM for you. In this case, you need to bring your identification documents to complete the process.

How do I know when my SIM swap is complete O2?

How do I know when my SIM swap is complete O2?

You will know that your SIM is swapped when your old SIM will not work, but your new one will be up and running within 24 hours. If you opt to do the SIM swap in a local 02 store, your new SIM will likely be active before you leave the shop.

An O2 SIM swap will only move your tariff and the cellphone number. Therefore, backup your contact list and other important information before proceeding with the SIM swap.

If the SIM you got from O2 isn’t the right size, you can benefit from the SIM swap. Alternatively, visit a local O2 store where you can put in the current SIM on your phone with the help of an adapter.

Also, if you can’t use the text service to activate and initiate the swap process due to a faulty SIM, contact 02 customer service.

What do you do if your SIM swap doesn’t work?

What do you do if your SIM swap doesn't work?

If your new SIM is not active after 24 hours, it means that the swap did not work. However, you can do some easy troubleshooting steps to correct the issue at your end.

To do this, first, turn your new phone off and on and see if that helps. Next, take out the SIM from the card slot and clean it with a lint-free cloth. Now insert the SIM back into the phone and seat it properly. If you still can’t use the new SIM, you may need to fill in a form to order a new O2 SIM.


Hopefully, this guide helped you determine why your O2 SIM won’t activate on your new or old device. In case your swapping method is correct, and your replacement SIM is not active after 24 hours, contact O2 customer service. In our findings, the best number to contact them for any SIM issues seems to be 0800 977 7337.