How to GiffGaff iPhone (All Models)
How to Giffgaff an iPhone 3G/3GS
How to Giffgaff an iPhone 4
How to Giffgaff iPhone iOS4 & iOS5
The settings you should input under Settings>General>Network>Cellular Data Network
For MMS the latest iPhone specifics are:
MMS Proxy: 188.8.131.52:8080
MMS Max Message Size: 2097152
Once that is done go to Settings go to Messages and check that "MMS Messaging is turned ON
(NOTE > MMS ARE CHARGED @ 16P)
Then Switch your iPhone OFF and then back on.
1>If you are unable to use MMS then re-check your settings for any typos.
2>Check you have enough credit on your giffgaff account - not just a goodybag, MMS are not included in goodybags or free GG to GG calls & texts
>Giffgaff doesn't support visual voicemail
>it is not possible to change the default voicemail number which is dialled by the voicemail tab in the call app. Create a contact called voicemail which you keep in favorites (voicemail number is 443)
>If you want a good visual voicemail alternative get the ON app which does that and much more (or Hullomail which isn't as good)