Today I received a phone call from my mother, frustrated that she keeps missing calls to her mobile. She isn’t the speediest at getting around and at the moment her phone is ringing only three times before the call is forwarded to voicemail.
On O2 you can easily increase the length of time the phone will ring before diverting.
Go to your phone and open the dial screen or phone app. Dial the following **61*901*11*NN# SEND, where NN represents the number of seconds you want it to ring for.