Extending your ringing tone
You can change the length of your ringing tone by typing the below code into your phone.
**61*(mailbox number)**(number of seconds you want it to ring for)# send
You can choose between 5 and 30 seconds. The standard ringing time is 15 seconds.
If you don't know your mailbox number it's just your normal mobile number with '5' added after the prefix. For example, 087 5 1234567.