02 Unlatch code not working

[Simmoderby]

Hi - I have received my unlatch code today to unlatch my phone from 02, so I can use a non 02 SIM.  Unfortunately the code is still not allowing me to unlatch.  I've tried the code twice already, don't want to lock it up completely by tring again.

It's a Sony Xperia if it makes any difference.

Any ideas please?

[MI5]

@Simmoderby 

Are you sure you have the correct type of code?

Guide: Unlocking an O2 phone to use a different SIM card 

If you have followed the above process I'll ask @EmilieT to help.

[Bambino]

@Simmoderby Have you tried a non-O2 sim in the phone? It may already be unlocked.

[Simmoderby]

I have been sent a 16 digit numerical code, which isn't working.  My phone only gives me the option to enter numbers, not letters............. ???

[Simmoderby]

Yep - not working.............

[Simmoderby]

Should my code be 15 or 16 digits??

[viridis]

Stop entering the code!!!

Entering an incorrect code more than 5 times will hard lock it

[Simmoderby]

@viridis - I have done so!!

[MI5]

There are no letters in an unlock code?

[Anonymous]

@Simmoderby 

If you have entered it more than 5 times then O2 won't be able to help unfortunately.

Had this happen myself some years ago with another provider and ended up having to buy a new handset.