First of all you're not going to find any free cellphone tapping software. However, the first thing you'll need to determine is the make and model of the cellphone you need to tap. Then you'll need to decide what type of functionality you need out of your spy software product. Next you'll need to purchase the cellphone spy software via online. Finally you'll need to install the software on the chosen phone (http://tapcellphone.com/).
Tapping a cell phone is as simple as downloading the right software. With the right software installed a cell phone can be monitored for phone calls, text messages, and more. For more information on the software and installation process see: http://howtotapacellphone.info/.