Hi, @starsky135 I use visual voicemail on giffgaff - it's a service called Hullomail.
There is a free version and a paid version. I've been using the paid version for several years now and I love it.
Here's how it works.
You setup a call divert / forward to a 0330 number which is allocated to you when you sign up for the service. So when someone calls you their call which is forwarded to hullomail will come out of your goodybag allowance. Then when they leave a message the APP on your phone picks up the message via mobile data / wifi and displays it as a notification on the phone.
You can then open the app and listen to the message as many times as you like for free.
This is really useful when abroad because you can pickup your messages free using Wifi in hotels/restaurants etc. No international call charges.
I also divert my home landline to the 0330 number so all my answerphone messages are received in my hullomail account.
You can even access the messages on a computer via the hullomail website.
Here's a screen shot of hullomail working on my phone.
I can highly recommend this system. You can try the free version and see if you like it.
This is an old thread, but you would do well to read it all the way through.
Hullomail works really well as a visual voicemail, and is available on multiple platforms. They actually say that it is compatible with giffgaff, and any others that use the same standards for diversion of calls.
It's certainly far superior to the basic voicemail service, though that is still needed for anyone without a smartphone.
The free version of Hullomail has adverts, but anyone who uses voicemail regularly will probably want to pay the small fee to get rid of adverts that say thing like "You have 2 messages waiting".
Automatic transcription is available as a paid add-on, "Get the Gist" for the first 10 seconds or 30 seconds. This could reduce the data usage, or at least let you see whether it's worth spending data on listening to the MP3 file.
You can also have the MP3 files emailed to you.