So every other day or so, I check my online ATT account to see what calls have been placed and usage of my minutes. Yesterday, for the first time, I noticed that there were some calls placed out to Atlanta, GA (678 area code) I did a reverse number lookup, and it came back showing it's a Cingular Wireless number. I checked my call logs on the iPhone and still no evidence that I placed a call. I end up calling the number and it's ATT Voicemail. I take a look at the times voicemails were received, and they match the times on the iPhone. So in a nutshell, this past weekend, the iPhone dialed out to collect voicemail. Some of the voicemails were still unheard and a call was placed out from the iPhone on 3 seperate occasions. This has only happened this past weekend. I thought our visual voicemail worked on the Data Plan on not mins??? Is it possible that if EDGE/3G is not available it uses mins???