移动网络制式更改shell命令：
settings put global preferred_network_mode1 1 ## 2g
settings put global preferred_network_mode1 0 ## 3g
settings put global preferred_network_mode1 9 ## 4g
移动网络制式更改shell命令：
settings put global preferred_network_mode1 1 ## 2g
settings put global preferred_network_mode1 0 ## 3g
settings put global preferred_network_mode1 9 ## 4g