Monitor Internetless appMonitor Internetless is Connectivity tool that is open source under the MIT license.
This application aims to allow the control of his phone from another phone without any internet connection. The data is transmitted by SMS which allows users to find their lost phone even if the phone had no internet connection when it was lost.
Only two commands are available due to the limitations of Android (it is impossible to activate GPS or mobile data without user interaction in recent versions of Android). The !info command allows you to retrieve any kind of information about the phone, and the !locate command allows you to locate the phone.
It is possible to define a list of numbers authorized to send commands and a password.