I can provide some general suggestions on how you might determine if someone is on the phone when you call them:
Call Waiting Signal: When you call someone who is already on another call, you may hear a call waiting signal or a busy tone. This indicates that the person is currently engaged in a conversation.
Voicemail or Call Forwarding: If the person you're calling has call forwarding enabled or is unreachable, the call may be directed to their voicemail. In that case, you will hear their voicemail greeting instead of the phone ringing.
Busy Response: Sometimes, when the person is already on a call, the call may simply go unanswered, or you may hear a busy signal if their phone service is set up that way.
Personal Experience or Knowledge: If you know the person well, you might be able to make an educated guess based on their typical schedule or habits. For example, if you often call them during their work hours, and they work in a busy environment, it's more likely they might be on the phone.
Caller ID or Call Display: Some phones or services show caller ID information, indicating if the person is already on another call. However, this may not be available in all situations.
Ask Politely: If you call someone and suspect they might be on the phone, you can politely ask when would be a good time to call back or if you should try again later.
Remember that it's essential to respect people's privacy and not try to eavesdrop on their conversations or persistently call them if they are busy. If it's urgent or important, consider leaving a voicemail or sending a message to let them know why you called and if they should get back to you when they are available.