If you are worried about your mates texts or phone calls you can always clone a phone. You can do it yourself if you are technical enough OR you can pay a fee to have it done, this Link should be helpful. Of course read further into it for details as any could be left out. It is also good ifyou're trying to cut down the costs of your cell phone bill ... Clone your mobile phone
If you are worried about the email account than you should get a keylogger. I have one and it's called Key Prowler. It is awesome. You can set the settings inside to your liking. It isn't free it ws when I downloaded it so I got lucky but it works GREAT !!! I'd suggest it. I have everyones passwords and even get screen shots every minute. You can set it to start working once windows is started and turn it off when you are on it. http://www.keyprowler.com/
If you are worried about their whereabouts ... I would suggest buying a small gps and hiding it somewhere in their car. If they do not have a car maybe you could search for a tiny one that could be easily snuck into the inside cloth of their purse, briefcase and or gym bag. I don't have the links for these but Im sure you can google it easily
Anyhoo hope this helps.
* Location: how to catch him/her
* it's NOT ok to contact this poster with services or other commercial interests
Courtesy: http://newyork.craigslist.org/brk/rnr/1211490337.html
