Originally Posted by avetny
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.
I'm so sorry..I'm really new to this and I think I had the same problem as above when I purchased an unlocked LG G Flex phone from Hong KOng and try to use it on ATT when I return to U.S. and that the speed is really slow when I had my apn on HSPA+ with the following info
mssc: UNABLE TO SHOW
mms proxy: proxy.mobile.att.net
mms port: 80
apn type: default, supl,mms,hipri
apn protocol: ipv4
The question is what is a "dialer" and where I put it on the phone? Or other things I need to know to fix my problem please?