How to check if the phone is turned on

Sometimes you want to confirm whether the other party is on. In addition to dialing the other party's phone number, sometimes for various reasons, you hope to have a way to verify whether the other party is on without the other party noticing. Hush SMS is such a small tool and green software.

Usage:

Check PING, leave the content empty, and send it directly to the other party. If he turns on his phone, he will receive a system message report. If he does not turn on his phone, he will not will be received, and there will be no response on the other party's mobile phone when sending text messages via PING (that is, the effect is hidden).