There are a few ways to tell if someone is on hold on their iPhone. The first way is to look at the time stamp on the call. If it’s past the time limit, they are probably on hold. The second way is to listen to the conversation. If someone is talking and there’s no music playing, they are probably on hold. The third way is to see if they have an active phone number in their contact list. If so, they are probably on hold for a customer or project that they’re working on."
