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AT&T USA | Internet not working | Fix by custom APN

If the AT&T Mobile internet is not working on your cellphone, it can be fixed easily by adding an APN configuration.

You can read this at my Reddit as well.

Go to Settings -> Connections -> Mobile networks -> Access Point Names; Edit an existing APN configuration or create a new one. Save and activate.

An iPhone settings is mostly at

Settings > Cellular > Cellular Data Options > Cellular Network
OR
Settings > Mobile Data > Mobile Data Options > Mobile Data Network.

The config given below worked pretty well on my Samsung Galaxy S10 5G device. It gives around 4.3 mbps download and 1.2 mbps upload.

APN: Phone
Proxy: Not Set
Port: Not Set
Username: Not Set
Password: Not Set
Server: Not Set
MMS port: 80
MCC: 310
MNC: 410
Authentication type: None
APN type: Internet + mms + dun
APN protocol: IPv4/IPv6
APN roaming protocol: IPv4/IPv6
Enable/disable APN: APN enabled
Bearer: Unspecified
Mobile virtual network operator type: none

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