Enter the settings into your iPhone exactly like this...
(go to Settings -> General -> Network -> Cellular Data Network) scroll to the bottom then hit RESET SETTINGS, then enter these:
same as above (or leave blank cos it doesnt work anyway)
MMS proxy: 126.96.36.199:8080
MMS Max Message Size: 2097152
MMS UA Prof URL: leave blank
Go back to the main settings menu then turn airplane mode on, wait a few seconds then turn it off
Got it working now! I was stupid enough to forget that Wifi Over rides 3G, I forgot the network from the iPhone and all is working well now! Thank you all very much for your help
Glad to see that!
Welcome to giffgaff danny!
I'm having the same problem with my 3GS iphone.
I've just connected to giffgaff today and I'm transferring my old number tomorrow.
I can use my phone to make calls, and I can connect to the internet via wi fi.
I've followed all the instructions to set the phone up, but I don't get the 3G showing in thae status bar and if I turn wi fi off I get "could not activate mobile data network" message.