It is also possible to install a software in a hp you wish to spy on, then u can call into the phone without the user suspecting... the phone u are spying will appear to be in its standby mode, but you can just listen to the surrounding sound of the phone you are spying on and conversation if any...
And there's also a software that once installed, u can just send an sms and retrieve the location where that phone you are spying on is at...
Scary... looks like time to change to the monochrome hp...
