I have an old nokia 5510 which is in good working condition. It is locked to a particular network (UK) but i don't know which.
I've tried the o2 and 3 mobile sim cards but get a 'sim card rejected' message. These are the 2 network or service providers i've used most often. How do i find out which sim card my nokia 5510 will accept. Thank you.
Read more: How to find old Nokia 5510 network provider?
