Not always. I have a weird bug with my iPhone where I'll receive voicemails, but the phone itself doesn't ring - others have reported this too (whether it's an O2 UK problem or what, I don't know).
Thus it's actually really useful for me to know if I have a missed call or a voicemail that never rang through. It also confuses the hell out of a system that'd try to guess which missed call the voicemail belongs to...
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Not always. I have a weird bug with my iPhone where I'll receive voicemails, but the phone itself doesn't ring - others have reported this too (whether it's an O2 UK problem or what, I don't know).
Thus it's actually really useful for me to know if I have a missed call or a voicemail that never rang through. It also confuses the hell out of a system that'd try to guess which missed call the voicemail belongs to...
Its definitely not a UK problem - happens here in SF w/ AT&T usually in my house when I can't get a signal ;-)