Maybe Apple uses the data network to send the voicemail transcription to the phone?
I'm most definitely NOT a VZW employee. If a post answered your question, please mark it as the answer.
Thanks, Ann. I know you have to have data turned on to see "Visual Voicemail". I just want the notification sound to make noise when I get a new voicemail, even with cell data turned off.
Even old flip phones would make a sound for new voicemail and missed calls. The iPhone 5 will not do this unless I have data turned on. Seems like a drawback.