network problem in sony xperia Lt28h

  arunbab 08:00 11 Mar 14

The user is having a sony xperia lt28h ion android model. The cellphone gsm network often drops in indoors.other functions like wifi gps are working ok.Recently due to a bootloop user reflashed the firmware.user attempted to remove the internal battery.My question whether device requires further servicing and examination.Is there any fault in the phone. phone's software and hardware spes Android version : 4.0.4 ICS Firmware : 6.1.E.0.233 Kernel 3.08+1.0.21100-30145-01960-gef48

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