Just spoke with Nextel. They confirmed what I already knew, it really isn't possible. She pointed out that Nextel has one of the highest security rating, that's why so many gov't agencies use them.

She called the number, the gentleman said he did some research, and someone did call from dh's cell and that's why their were incoming calls, someone in the house was returning the call.

I really dont know where to go from here. I emailed dh told him what Nextel said.