What happens is that I frequently miss calls, instead just receiving a message telling me I have a voice mail message waiting. Sometimes, the phone rings, but only twice before hanging up and diverting to voice mail.
People tell me that the phone rings their end about 6 times before diverting to voicemail. I tested it at home the other day, rang my cellphone from the landline 4 times. Twice the phone never rang and I was immediately diverted and twice my landline fone rang 4 times before the cellphone started to ring.
This doesnt happen all the time but often enough to be annoying, probably around 25% of calls.
Vodafones response has been to re-boot my phone :-(