How to tell if the other party is really turned off? How to tell if the other party is really turned off?

When we make a call to another person, how do we judge whether the other party is really turned off?

We can judge by sending a text message. If it shows that the text message was sent successfully, it means that the phone is not turned off. SMS messages sent when the phone is turned off are generally not responded to until the phone is turned on, but the SMS delivery reminder service needs to be enabled. You can also use a landline phone to make a phone call that is powered off, and use the response time to determine whether the other party is powered off or is an automatic reply set by the software.

If the other party’s mobile phone has a firewall installed, you can try calling from a landline. Most mobile phone firewalls use the call transfer function. When dialing a landline, there may be different prompts. It may say that the phone is turned off, or it may be Unable to connect, or the other party has set up call forwarding.