Use NetAlarm, you will never forget to charge a phone or miss an important call because of no coverage. Moreover, it protects your smartphone keys against accidental pressing, for example, in a pocket.
The program has three functions:
no network alarm
battery discharge alarm
phone keys automatic lock
All parameters can be adjusted independently for each profile. That's why, the program behaves differently during a meeting (silence profile) or in a car (outdoor profile). Auto Lock function automatically deactivates during charging, and that make easier to use a phone in a car or in an office. For each alarm you can choose suitable sound (system beep or wave,*.acc,*.rng etc.) or vibrating alert. The program starts automatically up after turn on or restart. Moreover, there is a watchdog application which looks after the main program.