After flashing, the voice call and SMS were more stable, I constantly got -51dbm in signal strength. Yet in terms of network connection I could only connect via EDGE (2G). When rebooting, the phone could connect to HSDPA (3G) initially, but after a while, it drops 3G and turns to 2G again, hence I believe the problem is not with the service provider.
Please see the screenshots for more details. My questions are: how do I improve connectivity and are there any other better modem base band to flash on my Note 3 (I bought the phone and currently live in Vietnam).
Appreciate your help. Thanks.