Unlock Samsung S7

[Froggy]

I used to be on O2 (Samsung Galaxy S7 phone). I changed to EE and ported my number when I got a new phone. Because of Coronavirus I am shielded and need to repurpose my old phone to use for work contact. I have a 3 SIM I would like to use but when I insert the Sim there is no service. How do I get this unlocked when I am no longer with O2 and also ported my number

[MI5 · Accepted solution]

@Froggy 

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

The PAYG route may be the quickest for you.

[Froggy]

Since I no longer have an O2 account and have ported the number that used to be associated with that phone how should I proceed - the form that can be filled out requests the type of account and the phone number?

[O2Faisal]

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@Froggy wrote:
Since I no longer have an O2 account and have ported the number that used to be associated with that phone how should I proceed - the form that can be filled out requests the type of account and the phone number?

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Once you have left o2, you can normally call up customer services, if they manage to verify you had an account with o2 and it was a handset purchased from ourselves then they will allow the phone to be unlocked. However they may ask you to purchase a pay as you go sim use it for 24 hrs then call back or fill in the form online to have the device unlocked.

[MI5]

@Froggy 

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

As I said, go the PAYG route.