I'm on the 3.01 OS with a 3g iphone. Lately, I've been having issues listening to voicemail. For example, someone will leave a voicemessage. A minute later I'll go to the visual voicemail and click on that particular message, but it won't play. The "hourglass" icon will just sit there and it won't play. Only if I try again in about 15 minutes will it finally play. I've received numerous messages and I've had to wait an extended period of time for each message to "load" up.