o2 change ring length for voicemail on the iPhone
Soon after playing with a friend's iPhone I was hooked. Then, to obtain my own handset, I was forced to change onto the o2 network because of the exclusivity deal they initially had with Apple to resell the handset in the UK. Since owning an iPhone, I honestly don't think I would ever consider purchasing a non Apple handset in the future! But, like all devices, even the iPhone has it's flaws. I had an issue recently when I tried to change the length of time my iPhone rings before voicemail activates.
On older handsets I have been able to set the length of time the handset rings by manually choosing a length of time in seconds, usually in a settings menu. But, not on the iPhone. From what I can see, as of the iPhone 4 there is still no option to adjust the ringing time from anywhere in it's settings. Luckily, most service providers allow you to make these kind of user specific setting changes using service commands. To modify the length of time your handset rings before voicemail activates for any handset on o2, dial the following service command on your handset as though you are dialling a normal telephone number:
Note: XX should be replaced by the time in seconds that you want the handset to ring for before voicemail activates. The value must be in multiples of 5 seconds. Values ranging from 05 to 30 seconds in length are acceptable. The default value is 15 seconds.
To turn voicemail on or off dial either of the following numbers:
Enable voicemail = 1750
Disable voicemail = 1760