HOW TO KNOW WHO CALL/FLASH YOU WHEN YOU PHONE IS SWITCH OFF OR OUT OF SERVICE
STEP 1. Dial *123# on your phone and send.
Select Answer and then press 2 for My
STEP 2. Select Answer and then press 9 for MORE
STEP 3. Select Answer again and press 1 for
Missed Call Alerts
STEP 4. Select Answer and press 2 for Notify Me + who called.
NOTE It work for MTN Subscribe Only but we'll Write Tutorial for other Nework too Soonest. Stay tuned &help us Invite ur Pal