I'm hoping someone with more knowledge of phones will be able to answer this for me, I'm quite tech savvy but I can't figure out this one!
I have a second hand iPhone that is locked to the o2 network. I'm happy with the phone but paying far too much on a sim only deal with o2. I know that Tesco uses the o2 network - does that mean I would be able to use a Tesco SIM card in my o2 locked phone? Also did consider getting the phone unlocked but not sure how I would do that when it's second hand and not tied to a contract if that makes sense...