There are many articles online that are claiming to be able hack a mobile phone without even touching it. These articles are written by armatures article publishers who are just doing a their job spinning an article. Currently there are 2 common ways used to hack a phone without touching it. the first method is used by law enforcement around the world. What you will need is an IMSI Catcher.
IMSI catcher, is a hardware device used for intercepting mobile phone traffics and tracking movement of mobile phone. How it works is very simple. It tricks phones in your vicinity to think that you are are the cell phone tower. And the phone makes the call via your IMEI Catcher to the cell tower. In this method you can track every calls within your surrounding. These devices are very clean and efficient. There are several drawbacks to this system. * You need to be close to the phone you are tracking. No more then 50 meters. * They are very expensive. A simple device will set you back around 20 thousand dollars. If you can have the time to keep close proximity to the phone you are tracking and have the means to afford this, then this will be the product for you. It is very efficient and very stealth.