Hi guys. If you are having trouble connecting to Giffgaff on the APN settings, don't follow any information on the net as i've spent hours with no luck. Just leave everything as it is but just change the APN Protocol from IPV4 to IPV4/IPV6. Enjoy!
Name : giffgaff
APN : giffgaff.com
Proxy : not set
Port : not set
Username : giffgaff
Password: password
Server : not set
MMSC : http://mmsc.mediamessaging.co.uk:8002
MMS proxy : not set
MMS Port : not set
MCC : 234
MNC : 10
Authentication type : not set
APN type : default,dun,mms,supl,hipri
APN protocol : IVPv4/IPv6
APN roaming protocol : IPv4
Bearer : unspecified
MVNO type : GID
MVNO value : 50