When I receive a call it goes straight to voicemail without my phone ringing
My husband and I have iPhones with a shared account. If I lose my phone, we could call it to find. But when we call my phone from his, it goes straight to voicemail. Or, if he's out and about, same thing: straight to voicemail without my phone ringing. How can we call one iPhone from another on a shared account?
[Re-Titled by Moderator]