Samsung Galaxy S7 Edge SM-G935A ATT Phone Transfer to T-Mobile

This is the short version for now.

T-Mobile support could not get data service to work with an unlocked Samsung Galaxy S7 Edge SM-G935A ATT Phone.

Problem is there are too many mobile networks vying to connect you to data service.

Here is the solution.

Settings -> Connections -> Mobile Networks -> Mobile Data -> Make sure it's on! <- Back

-> Access Point Names ->Ellipses -> Reset to Default

Select and delete EVERY acess point except for default selection by selecting APN -> Ellipses -> Delete APN

Delete every one except default selected APN. Then make sure you have the following settings.

Access Point Name (APN): fast.t-mobile.com
MMSC Server: https://mms.msg.eng.t-mobile.com/mms/wapenc
APN Type: default,supl,mms
APN Protocol: IPv6
APN Roaming Protocol: IPv4

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