I have a iphone 4, and my mom got a galaxy note 2 but she doesn't like the phone and wants to switch with my iphone. will it work if i just switch the 2 sim cards? or will it not work?
Both are same network means,No problem.You will be able to use it.
If it's different network means,you will need to unlock your mobile to use your own sim card.For unlocking you can approach your service provider or else try to buy an unlocking service from any one of the online unlocking service provider like SimpleUnlocking.com I hope it will be very useful to you.