I updated my iPhone to iOS Beta 6 a couple weeks back and ever since I have not been receiving visual voicemail notifications. Initially I thought people were just not leaving me voicemails but once I finally called into voicemail by holding the number one on my iPhone keypad to check voicemail I realized I had 25 voicemails. Once they were all cleared out I moved on the trying to fix the visual voicemail issue which turns out is really easy to resolve by following the below steps.
After upgrading my iPhone to firmware version 3.1 my Visual Voicemail stopped working. Initially I wasn’t sure what the issue was but I was not receiving voicemail via the iPhone. I did finally find out that I could retrieve the voicemail by holding the 1 key which will then dial voicemail and let you retrieve your voicemail. If you are able to retrieve your voicemail by holding the 1 key but the voicemails are not showing up in the iPhone voicemail interface then there is an issue with what ATT calls Visual Voicemail.
Awhile back I accidentally assigned a Speed Dial key to the number 1 on my BlackBerry 8320 Curve cell phone. The problem with this is that the 1 key is reserved for Voicemail. When VM is dialed with that speed dial key then the Voicemail Settings are used so if you have password protected your voicemail, as noted here, then you can have the password automatically entered when dialing VM by using the 1 Speed Dial key.
The newer versions of Skype, which include version 4 and above, appear to not provide a way to list or delete voicemail messages. There are two options I have come up with to resolve the issue of managing Skype voicemail messages. I would think that Skype will resolve this issue in the near future however it has already taken longer than I would have thought to provide a solution to users to manage voicemail. I am currently running Skype version 220.127.116.11 so the below information is based off of that Skype version which at the time of writing this article is the most current. I recommend using option two which includes a third party piece of software so you still get the benefits of the latest release of Skype.
I should start by saying there is not a single scenario where you should have a T-Mobile voicemail account set up without the password being enabled. The reason for this is access can easily be gained to any T-Mobile voicemail account unless you have your voicemail password enabled.
To provide an easy example if you have any VoIP soft phone that allows you to configure the CID (Caller ID) displayed when you dial other numbers then all you need to do is enter the number of the voicemail you want to access and call that number. This will provide you immediate access to that voice mailbox unless the user has their voicemail password turned on. As you can see this provides an immediate security risk and would allow anyone at any time to access your voicemails without your knowledge. So again no matter what T-Mobile device you have make sure that if your voice mail is setup that it has the voicemail password enabled.