BT Mobile APN Settings for iPhone

BT Mobile 4G LTE 5G Internet and MMS Settings for iPhone 12, iPhone 12 Pro, Pro Max, SE, 11, X X Plus 8S 8Plus iPad Mini Air

BT Mobile UK iPhone iPad APN Settings

In your Apple iPhone go to Settings -> Cellular -> Cellular Data Network -> APN and enter the following details

Cellular Data:
APN: btmobile.bt.com
Username: bt
Password: bt
LTE Setup(Optional):
APN: Blank
Username: Blank
Password: Blank
MMS:
APN: btmobile.bt.com
Username: bt
Password: bt
MMSC: http://MMS/
MMS Proxy: 149.254.201.135:8080
MMS Message Size: 1048576
MMS UA Prof URL: blank