iphone settings are here:
Here's the settings for the iPhone 5c/5s
please can you first reset the network settings by going into
Settings ~ General ~ Reset ~ Reset Network Settings
(once pressed the iPhone should reboot by itself )(<------important )
Depending on your iPhone iOS version and international language ""British English"" Or ""English""
Settings~Mobile~Mobile Data Network
Settings~Cellular~Cellūlar Data Network
•mms Proxy = 220.127.116.11:8080
•mms Max Message Size = 2097152
After editing the settings just press the Home Button (don't press the reset tab) ,Now please reboot your iPhone
MMS will NOT work unless 4G (3G) is ON
Lastly check that the MMS button in the Settings. (Settings~Messages) Make sure MMS Messaging is set to ON.
And remember that MMS / Picture Messages cost 16p (24p for none uk networks )and are not included in any Goodybag ( Mobile Data must be on to receive MMS messages)
You do not need to turn off wifi, but you do need to install the giffgaff APN settings. You do this in your iPhone's settings menu by choosing the green icon 4 from the top called Cellular or Mobile Data, then choosing Cellular Data Network or Mobile Data Network. The options you need are APN giffgaff.com, username vertigo, and password password. That's literally the word password, not your giffgaff password or anything else.