How to check whether the other party's mobile phone is turned off without calling? ..

There are many kinds of inspection methods.

You can turn on the SMS reminder of the mobile phone in the mobile phone settings, and then send a blank SMS to the mobile phone. Received a text message to report that the other party turned on the phone. If you don't receive it, it may not be turned on.

If the other party is a mobile phone and the service of Fetion is enabled, you can check the status of the mobile phone through Fetion. If the transmission is successful, it can be explained that it is turned on.

You can't make a phone call from your own phone. You can try calling from a public phone to check the status of the other party's mobile phone.