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Unlocking an O2 phone to use a different SIM card.

by on ‎03-11-2016 16:01 - last edited on ‎11-09-2020 15:02 by Community Manager (367,763 Views)

Please note: all new O2 devices are sold unlocked, so you just need to test a different SIM in the phone before you request unlocking. If it is indeed locked, then you can follow the rest of this guide.

Note also that since June 2018 it is completely free to unlock any O2 phone at anytime. Smiley Happy


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If you want to use your O2 contract or PAYG phone with a SIM from another network, ie a local SIM when on holiday, you will need to release the network lock.


If you have a monthly contract it is free to get your phone unlocked......


Any phone can be unlocked (No exceptions).

The easiest way is by using the link found in your MyO2 Unlock (this assumes that it is the current phone you are using is the one you want to unlock)

If you want to unlock a phone you have stopped using, all you need to do is submit this form manual form taking care to enter the correct details. Pay attention in particular to the security question as this is the most common cause of failure.


PAYG as above.


If you have just purchased a PAYG phone which was previously supplied by O2, insert an O2 Simply PAYG SIM free sim and top up. Make a few calls to register the phone on the network then fill out the form as above manual form


Business users can also submit the form for a free unlock.


Once the form is submitted it can take upto 28 days to receive the unlock code but it is usually much quicker - Typically within 7 days.


You will receive the code with instructions on how to complete the process with your specific handset, but in general, you insert a non O2 SIM card and enter the code when prompted.

For iPhones you will not receive a code. Just replace the O2 sim with one from a different network once you receive notification that it is unlocked.

If the unlock fails first time, try connecting to iTunes to complete the process, but this is not required for every phone.


Note: Unlocking the phone does not relieve you of any contractual obligations. You still need to complete your minimum term as agreed.



Note for iPhones:

If you’ve already requested an unlock for your iPhone but you feel it hasn’t worked, try the following:

1) Insert a non-O2 SIM in the phone

2) Connect to Wi-Fi

3) Go to Settings > General > About, and enter your Apple ID and password, and you should be good to go.

If it’s still not working, please contact customer services on 202 or 4445 or post on the community so we can escalate the issue for you.



on ‎26-10-2020 17:05

Welcome Smiley Happy

on ‎14-12-2020 18:56

Hi Everyone, 


So I have made a cataclysmic error! I ordered a new sim from a different network provider to replace my current O2 sim, and through my own stupidity I entered the code incorrectly too many times (i read the wrong websites and misunderstood what I was meant to do). So after the 5 attempts I am not allowed anymore. Is there anyway of undoing/refreshing this? 


I have an android phone.#


Thank you!

on ‎14-12-2020 18:58

Depending on your phone type you may have hardlocked it now

on ‎14-12-2020 19:10

@Martin-O2 should be able to help you @AW2 

on ‎14-12-2020 19:56
@MI5 thank you!
on ‎14-12-2020 20:08

thumbsup @AW2 

on ‎15-12-2020 15:00
@jonsie it's a Sony Xperia xa ultra. Is there any way I can find out?

on ‎15-12-2020 15:06


Might be best for you to private message @Martin-O2 as I don't think he saw the tag.

It's definitely hardlocked now due to too many failed attempts.

on ‎15-12-2020 15:17
@MI5 I have messaged him. Thank you again for your help!
on ‎13-02-2021 23:31
Please send me an unlock code for Microsoft lumia 550 - 355132078658103 - mobile number 07873993313
on ‎13-02-2021 23:35

This is a public forum @Andrew11, so anyone and everyone can see it.
Please come back and remove your number.
If you want to unlock your phone to use another sim in it, the best way is to use the My o2 app and request it there.