Was there a number on hte phone when the person hung up?

Invite your wife to call the number herself if it bothers her... let her sleep with the damn phone if she wants to.

The more she covets that phone of yours, the more she loves you.. got it?

Let her carry the phone around as much as she wants. If you need to make a call, do it with her in the room.

Leave your wallet out too so she can go through it, dont' INVITE her to do that, just leave it out and see if she picks it up.