I am presently using Sony E w300I its fine working but then I got a Sony P1I which my friend was using. The problem is when I inset my SIM I can�t make out going call on P1I but If I Insert other SIM (network Operators SIM) I can use P1i fine can dial all outgoing call. Where as my SIM I�m using is fine in my old Sony W300i it can be used in other phones to. I don�t understand what the problem? Is it with the phone? SIM is no bard as I can use it in other phone same was phone too is not bared as I can use my friend SIM & make call.