Does cell spy really work

want to catch cheating wife using spy cell

No. None of those cellphone spying type things work, they are all scams. The cell phone providers would notice someone leeching on their phone connections (in this case, it would be the "cell spy" company) and would immediately put a stop to it.

Hail no

there are much better ways of finding out.

would you want somebody to do that to you? if you distrust her so bad LEAVE.... without trust you have nothing