We have sony xrepia m dual smart phone.when i set network mode wcdma (preffered)/ gsm.and when i disable the data traffic. both sim become inactive. & i unable to call by both sim. no coverage signal .The phone required to turn off & again turn on for calling. why this is so?when i select network mode in GSM above probleme is not come. both sim work excellent. & not need to turn off yhe mobile.i use 2G sim on which 3g internate pack use.so plz. guide which mode to be select on above sim ?OR can probleme in handset ?
