Feb 26, 2015. If you have a Pay Monthly O2 SIM, it comes pre-activated so you merely have to insert it. For Pay & Go SIMs, you'll need to first top up The O2 Top-Up number is 4444 or +441753 552 277. You'll need to create a Giffgaff account if you don't have one. Before you do, make sure you save your contacts to your phone and back up anything important (like photos or videos), as anything on your SIM won't be transferred. If you're a pay as. You can also move your number to a different Tesco Mobile SIM by taking your new SIM card in store or by contacting us. How long for O2 to activate the sim card? And try to activate the phone using the 02 sim. You can use any o2 active pay monthly sim card which is 3g. I've recently purchased a Samsung B5310 Genio Slide phone on o2 and therefore purchased a PAYG sim card to go with it, earlier today. I've put the sim in my phone and the 'O2-UK' has come up on the screen, but whenever I try to ring my mobile number, I just get a long 'BEEEEEEEEEEP' noise, as if the number doesn't exist. On the o2 sim card packaging it says 'Must activate by 01 Dec 2011' but how exactly do I activate it? ![]() I found 'on Google and tried to activate my sim via that website, but whenever I put in the number on the back of the sim which it asks for, I get the message 'The sim card number that you have entered doesn't seem to be valid'. Do I need to top up the phone for it to become activated or something? ![]() Thanks in advance. ![]() ![]()
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