Shay -
I think you are totally right about the cell phone thing. You don't have to justify to him why this made you suspicious - of course it did. He should be anxious to do whatever it takes to reassure you. So I would state what you need to feel okay about the phone:
- you see the bills every month
- you know how to access the voice mail

Then - look forward to using the phone to flirt with your H!

Ellie