Mobile phones?

If I bought 2 mobile phones on the same network would I be able to switch sim cards without having to unlock the phone would it work?

Mobile phones?
If its the same network (e.g. both phones are on O2) then if you have an O2 sim then you can switch it between phones all you like.


If its an Orange or another network sim, you can't stick it on an O2 mobile, unless you unlock the network, which costs about £10, in a market or somewhere like that