1) Replace your SIM card 2) Try other network provider's SIM too. 3) Updating your software 4)Settings –>Connections tab –>More Networks –>Mobile Networks –>Network Mode –> ---- gsm only (if 2g) & wcdma only (if 3g).. Check if this works for you .. Please check the signal may be you are in low signal area. Network scanning depends on signal strength.
