After receiving the November 5, 2017 security update to my Huawei Mate 9 Pro phone, data connections to the LTE T-Mobile network are very unstable. Rebooting allows a data connection only for a few minutes and then you are disconnected from data.
This appears to be a bug in the software update. A work-around is to add a new APN that uses the legacy “epc.tmobile.com” server instead of the “fast.t-mobile.com”.
- Create a new APN called “T-Mobile Legacy”
- APN: epc.tmobile.com
- MMSC: http://mms.msg.eng.t-mobile.com/mms/wapenc
- MMC: 310
- MNC: 260
- APN type: default,supl,mms
- APN protocol: IPv4
- APN roaming protocol: IPv4