Want your Sony Xperia S to ring for longer? Here's how to change the ring pattern.
Using the keypad, dial **61*Divert No.*11*N#
Then press the call key and you're all done.
N= number of seconds you’d like it to ring for (from 5 to 20 seconds). If you want to increase the number of times just enter a higher number for example for 20 seconds enter 20#.