Nokia
Network disapears always goes to offline mode

Dear sir, just brought E90 nokia, cel been having loads of problem the network goes away automatically goes away too an offline mode, i have sent it for correction more than 4 times in nokai center which is in irrla, your company being such a reputed, having this problem would really appreciate if you cld change my hand set . my handset number is imei;353660011031576 ; code;0544491;wlan; 001adc0192f1 ;o670519