Help Call Faliure?

[snowman1109]

when i call people the phone ethier cuts out upon dialing or somtimes i dont get a dial tone or i can be having a convosation n it cuts out, my reception is fine never had a problem of cuting out before with other phones on tmobile today i havent bin able to recive or call people as its just bin cutting out... recon my models faulty? had the phone about a month now had the problem since i got it but its slowly got worse n worser :/ cheers