When I use visual voicemail on iPhone to check my voicemail, does that cost my minutes?
no. it doesn’t call out but rather works through the edge network using your unlimited data.
more detailed iphone voicemail info , refer:
http://www.wireless.att.com/support/setDevice.do?universe=cingular&make=Apple&model=iPhone&x=1&y=5

Tags: iphone-voice-mail-help, iphone-voicemail-instructions, iphone-voicemail-setup

iphone voicemail help, How do I change my iphone voicemail password?
you can change and reset your iphone voicemail password, with att support. there are two ways to change iphone voice mail password.
To reset your  iphone voicemail password from AT&T’s automated system:
1. Call 611 or 800-331-0500.
2. Enter your wireless number starting with area code.
3. Press 3 [...]

Tags: iphone-voice-mail-help, iphone-voicemail-instructions, iphone-voicemail-setup

iphone voicemail setup , Can I call into a local number to access my iphone voicemail remotely?
before with my razor I could call into a different number (ATT/Cingular) to access my voicemail. That no longer works since I got the iphone
Sure. From ATT.com:
Checking Your Voicemail Messages From Other Phones
Dial your 10-digit wireless number.
Press the * [...]

Tags: iphone-voice-mail-help, iphone-voicemail-problems, iphone-voicemail-setup