I got F340K (F340L also tested) unit from Korea. Which is supposed to work everywhere on 3G in US T-Mobile (and on AT&T I guess)
but I faced with problem when the phone almost everywhere stuck on 2G. The problem located not in APN settings. We just need to manually enable write bands
How to fix it:
1) Type in dialer: 5457#*340#
2) Click on: Band selection.
3) Mark on: LTE B1 (2100), LTE B3 (1800), LTE B8(900). Do not touch other marks.
4) Press: Save
Phone will reboot. Now you got full 3G coverage everywhere you go.
but I faced with problem when the phone almost everywhere stuck on 2G. The problem located not in APN settings. We just need to manually enable write bands
How to fix it:
1) Type in dialer: 5457#*340#
2) Click on: Band selection.
3) Mark on: LTE B1 (2100), LTE B3 (1800), LTE B8(900). Do not touch other marks.
4) Press: Save
Phone will reboot. Now you got full 3G coverage everywhere you go.
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