My sim keeps saying that there no service

[Bennyboy]

my friend gave me his old iPhone 7 because he got a upgrade but when I tried putting my giffgaff pay as you go sim in the phone which is locked to o2 it keeps coming up as there no service how can I make it so that my giffgaff sim works in the o2 locked phone

[MI5]

@Bennyboy your giffgaff sim should work in an O2 locked phone, but try the process here to unlock it first https://community.o2.co.uk/t5/How-to-Guides/Unlocking-an-O2-phone-to-use-a-different-SIM-card/ba-p/1...

[Marjo]

Hey @Bennyboy, please do let us know how you're getting on with this. Have you made any progress yet? Any help from the above link from @MI5?

[Bennyboy]

I still haven’t got anywhere I looked in the setting and it said that the “phone not alllowed” I don’t know what to do

[Cleoriff]

@Bennyboy

It sounds as if the phone may have been blocked for some reason. Check here

https://www.checkmend.com/uk

Or this

http://www.imeipro.info/

[MI5]

@Bennyboy ask your friend to put his sim back in the phone and see if it works for him.