In SpinningW's case a VAR may not be all that informative. The recent acting out of her WH has been via electronic communication and via contact in porn video parlors, etc.
Assuming the Tracfone is his he may intend to use it for internet access, sexting, photo sending and receiving and so on, but not necessarily for talking. She'd have to have access to the actual phone in order to discern what he's up to. After all of this, that's not likely to happen!