i have just changed phones put my sim in and it says giff gaff and 4g but i can not make or receive calls help
First try switching on Flight mode and then off again.If no good then.....
Sometimes the Network APN settings need refreshing and this will
rescan the networks.
These are the Network APN settings I use on Android for both UK and EU.
Connection Name: giffgaff
Proxy: Not Set
Port: Not Set
MMS proxy: 220.127.116.11
MMS port: 8080
Authentication Type: "PAP or CHAP"
APN type: default,supl,mms
APN protocol: IPv4
APN roaming protocol: IPv4
MVNO type: IMSI
MVNO value: 23410x
Remember to press save from the options and then shut the phone off for a few mins and then reboot.