SIM cards do not always work for any cell phone, as most wireless providers lock their phones to their specific network. Putting a SIM card into a cell phone locked to a different company usually...
Not necessarily. Particular GSMs operate in different frequency ranges e.g. 850/900/1800/1900 etc. Different cellar providers use different frequencies. Though most are frequencies are supported by...
No, it will give an error message asking for the unlock code. Once you get that error, you screwed up the sim and it will not work in either phone again and it locks up your phone and it cannot be...