Blackberry extend rings until voicemail

for some reason a Blackberry by default goes to VM after 2 rings. To change it you're supposed to call your service provider. Alternatively you can just enter one of the codes below:

**61*121*10*30# Then press the call button VODAFONE

**61*901*10*30# Then press the call button O2

**61*123*10*30# Then press the call button Orange

**61*150*10*30# Then press the call button T-Mobile