how do I find my SIM PIN?

[Anonymous]

how do I find my SIM PIN?

[MI5]

Default is 0000

[Beenherebefore]

How have you used the phone to date if you don't know the PIN ?

[MI5]

If you need a PUK, look here http://www.o2.co.uk/apps/getPUK/welcome
If you have changed your SIM PIN and can't remember it, you need to do a sim swap and get a new sim.
Any O2 HighStreet Store can perform the swap in store or a person can take the SIM card home or request one via O2 Customer Services. 202 for Contract. 4445 for PAYG. 8002 for Business -> http://www.o2.co.uk/contactus
Sim Swap link -> http://swapmysim.o2.co.uk
Be sure to ask for an Account Specific Blank SIM card as Contract and Pay As You Go versions hold different information.
The Service will stop on the original SIM card which indicates the swap has started. Turning the phone Off and On , or if applicable switching airplane mode On and Off ,with the new SIM card in every 20 minutes or so will typically help the connection to settle.

[jonsie · Accepted solution]

If you enter the sim pin incorrectly 3 times you will then need your PUK. Enter the PUK and it will ask you to set up a new pin. This is only if you have forgotten the pin you set up. Otherwise, as said, default pin is  0000.