If you are a UK customer of O2 and you are travelling abroad you may want to take note of what might happen if you do not turn off your voicemail while you are gone.
I speak to you from experience of having incurred quite a few charges for calls that I did not even take (and who did not even leave me voicemails) whilst I was on a recent business trip. I had a local phone so I did not plan on using my O2 phone whilst away. However, each time somebody phoned me and I did not answer I incurred two charges – one of £1.25 listed as my own phone number as the destination and one for £1.50 going to this number: 7802091901.
So, each of these calls that I did not answer cost me £2.75. Ouch.
The thing that comes out of this is that if you go abroad you should turn your voicemail off if you are with O2 (I am not sure what other networks charge). I have been advised that if you do this then you will not incur charges for incoming unanswered calls.
The way to turn off voicemail for O2 is to dial 1760. When you want to turn voicemail back on dial 1750.
Hopefully this will stop other people incurring other unwanted costs on their mobile bill 🙂