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Try these here,
Go to > Settings >
> Wireless + Networks > Mobile Networks >
> Access Point Names > Tap the Menu key >
> Select 'New APN'
Enter the following;
Server: http://mmsc.mediamessaging.co.uk:8002 sometimes not needed
MMS proxy: 18.104.22.168
MMS port: 8080
And then 'Save'.
Turn on off airplane mode thats it !
See pic for snap shot : http://bit.ly/P0QsBY
Use the Back key and tick 'USE PACKET DATA'.
(Please make sure to enable packet data )
Go back to the home screen. Then Reboot your phone.
Please Note: that MMS is not included in any goodybags: they cost 16p,
For Android 4.0, 4.1 & 4.2 Jelly Bean & ICS Internet and MMS Settings,
These settings are subtly different to the ones for previous versions of Android.
Go to Settings.
Choose More Settings.
Choose Mobile networks.
Choose Access Point Names.
Press the Menu button on your phone and choose New APN.
Tap Name and type giffgaff, then tap OK.
Tap APN and type giffgaff.com then tap OK.
Tap MMSC and type http://mmsc-ac.mms.o2.co.uk:10021/mmsc
Tap MMS proxy and type 22.214.171.124
Tap MMS port and type 8080
Now press the Menu button on your phone again, and choose Save.
Tap the little circle to the right of the profile named giffgaff on the list. It should turn green.
Your phone is now set up for giffgaff's internet and MMS settings.
Here is the shortlink to this guide: http://bit.ly/ggjellybean
Internet and MMS settings for Samsung Galaxy S3 (Also for Galaxy s2 on icecream sandwich) http://community.giffgaff.com/t5/Learn-giffgaff-To
Or download and run the Tweakker ICS APN Beta app from Google play using wifi.https://play.google.com/store/apps/details?id=com.
With these settings on a Nexus 4 this is what i receive every time i am sent an mms, sending one doesn't work either. Have asked an agent multiple times and they say they don't troubleshoot handsets and then we just keep going round in circles, I'm told to ask the community which didnt work ( http://community.giffgaff.com/t5/Help-Ask-the-comm
I've had this same problem with an iPhone4 S3 and now Nexus 4 and i have no idea who to turn to, even phoned up O2!