sameer918 Mostly china mobiles are coming for network cases. Emergency* Or tower is full but call failed. Set is fresh. What to do? check imei may be only one imei on the screen now you need to rewrite both imei your problem will go 80% and 20% cases are mostly in M3* M1 dual battery type phone i have seen in some cases mobile work 100% at supply at 4.5 volts but one battery showing emergency and some cases on smal battery work good and on big battery same like first emergency. this problem from power section may be any resistance has lost its value. i am still searching. it seems problem comes from dual battery switching system. can some one point out dual battery switching system area or have any diagram for this?