If you have a mobile plan with Singtel, the default ring time for incoming calls is 15 seconds. You can adjust that yourself up to 30 seconds, by doing this:

1. Go to your mobile phone’s dialer pad
2. Enter **61*1389**30# and then press the Call button. (Change ’30’ to whatever number of seconds you want the rings to last, up to 30.)
3. No call will be made but you should see a text confirmation.

Some bloggers indicate that one can go up to 60 seconds if one disables voicemail. (If you are a business, please don’t disable your voicemail. Providing your hours of operation in your voice greeting is very helpful.)