[Net Trouble Help] is the manual for a trouble of Data-transmission.
Although you enable Data-transmission, Android smartphones rarely can't connect to mobile network.
When your smartphone is disconnected, you can't search the internet for the trouble.
If you install [Net Trouble Help] in your smartphone, you can read how to solve the trouble without the internet.


Enduser lisence agreement (EULA)
http://fujiu.jp/AndroidApp/app007_net_help/trouble3g_eula.html