Originally Posted by doraemon616
Help, I'm using Nexus 5 Field Test Mode to unlock BAND 41 can not enable China Mobile 4G TD-LTE, 3G TD-SCDMA! How to unlock LTE bands, so my Nexus 5 can be used in China Mobile's 4G TD-LTE, 3G TD-SCDMA! That gives tutorials and address!
求助，我使用Nexus 5 Field Test Mode 解开BAND 41无法启用中国移动4G TD-LTE，3G TD-SCDMA！如何才能解开LTE频段，让我的Nexus 5可以在使用中国移动的4G TD-LTE，3G TD-SCDMA！知道的给出教程和地址！
Just go to Chinese forums of Nexus 5, there are plenty of discussion of it.
1. China Mobile have 3 bands (39/40/41, 41 is super set of 38) been allocated, and Nexus 5 supports only band 41, for LTE-TDD.
So, first of all, you MUST MAKE SURE China Mobile is USING band 41 to provide LTE-TDD where you have your tests.
2. Nexus 5 does not support TD-SCDMA, and it seems do not support FR-CSFB. (or China Mobile did not support it yet.)
So, N5 can not go to LTE automatically through the route: 2G (GSM) -> 3G (TDSCDMA) -> 4G(LTE-TDD).
You MUST using *#*#4636#*#*, select "LTE Only" to force it connect to LTE, and then using "LTE/GSM auto (PRL)" to enable it using CSFB for incoming/outgoing voice service.
Ensure you have 4G USIM card and enabled 4G service using SMS.