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How to set up a SIM pin on O2

by on ‎28-11-2014 16:49 - last edited on ‎17-12-2018 16:36 by (11,205 Views)

Everyone should set up a sim pin lock on their phone, more so if you have a contract phone. Combined with a screen lock it's the best security against unauthorised usage should the phone be lost/stolen or left unattended.



  • Go to settings and tap on phone settings.
  • Scroll to the bottom and tap on sim pin.
  • Slide the toggle to ON.
  • Enter the O2 default pin 0000
  • Tap change pin.
  • Enter the default pin again 0000
  • Enter a 4 digit pin you can remember, preferably not your birthday.
  • Re-enter your chosen pin and it should then be set up. As well as safeguarding your phone it will also prevent the sim being used in a different phone.
  • Bear in mind that entering the sim pin incorrectly 3 times will block the sim. If this happens you will need the PUK (Pin Unblocking Key). This can be found in My O2 or by calling customer service or using Web chat.
  • Entering the PUK incorrectly 10 times will permanently block the sim card and a new one will be required.



  • Very similar set up to iphone, again all you need is the default pin 0000
  • Go to Menu and Settings.
  • Security/Set up sim card lock.
  • Tick Lock sim card.
  • You need to enter 0000 then a new 4 digit pin which you will be asked to confirm.
  • The exact same conditions of 3 attempts then PUK  also apply to Android or Windows etc.
  • Combine this with a screen lock and a security app such as Lookout, Avast or similar and you have done as much as you can to prevent unauthorised use of your simcard . 

on ‎28-11-2014 17:51

Thanks for this @jonsie  I am sure you will be delighted to know I have just completed this successfully Smiley Wink

on ‎28-11-2014 17:55

Nice one Den...just to let you know it's fairly late here and Lou pointed out a few typos, hence the edit...

on ‎28-11-2014 18:09

@jonsie wrote:

Nice one Den...just to let you know it's fairly late here and Lou pointed out a few typos, hence the edit...

Its 1.07am and 28c where you are @jonsie  Slowly getting round to doing all sorts ...as you see..LOL

on ‎28-11-2014 19:08

2.06 now and time for home according to some...

‎01-12-2014 15:40 - edited ‎01-12-2014 15:40

Only just had the time to read this!

Lovely job jonsie, I'll add it MI5's guide list Smiley Happy

I'm also looking at improving that thread's structure, so that guides are separated into the sections of their respective boards. It might make it a bit easier to follow?

on ‎01-12-2014 16:43

Cheers @Toby Smiley Very Happy