My causin bought for me samsung SHV-E120s from china which when i put Airtel Gsm band 900mhz to 1800 mhz only shows zero with across at the centre on whre gsm network bars comes. The fone Model no:SHV-E120s
,Android version 4.0.4
. Kernel version:3.0.8-1045781
What do i need to do to this fone to make it work and bring network bars.