puk code

[Anonymous]

im trying to unlock sim , but need puk code and dont no the mobile number either, can i find out with the number printed on back of sim card

[MI5]

Easier to just do a sim swap unless you can find the mobile number.

[Anonymous]

what im really trying to do is, i got lumia 735 with preveiw w10 update which caused lots of problems so i bought a new lumia 735, i just want to reset it to old 8.1

[MI5]

You don't need a sim then at all do you?

[MI5]

http://www.windowscentral.com/roll-back-windows-phone-81-windows-10-preview

[jonsie]

Why don't you know the number. It will be in My O2 if you have registered. If not pick up a new sim from any supermarket for 99p. 

But as MI5 says you don't actually need a sim to do what you want....

[Anonymous]

Hi @Anonymous

Ring customer services and have your sim card on you and they should be able to help you         

Contract From your O2 mobile	202
From a landline	0344 8090202

Pay and go From your O2 mobile	4445
From a landline	0344 8090222