Locked SIM

[Ernie2]

Used up in error 3 goes on SIM so locked out. How to undo?

[jonsie · Accepted solution]

Phone should be asking for a PUK code

Get it here

Unblock your mobile device | Phones sims and devices | Help | O2

or via My O2

[MI5]

@Ernie2 

If your PUK won't work https://www.o2.co.uk/help/device-and-sim-support/unblock-your-phone

you'll need to get a new sim. Pop into any O2 store with photo ID to get one.