You have just bought one of many models of Samsung cell telephones. When you get it home, you attempt to use it with another network provider, and you find out you can not. It may be that you have not unlocked your mobile telephone yet. Why is your telephone locked to start with? The solution to this is easy. The company you purchased your telephone from would like for you to use only their network so they have placed special kinds of locks on your telephone that prevent you from using other networks.