I've tried two other "similar" products that did not work at all, and then one that worked for less than a day before it stopped inexplicably and my attempts to get help from the company were futile. I was not expecting cellspy to work, but I figured the company has a good reputation and you're easy to contact so why not. I would like to say to anyone that needs to monitor a cell phone, do yourself a favour and contact intertel. Cellspy does what it says it does.