How to detect cell phone spy software?

There are lots of technologies available nowadays to track and monitor people.  It is possible to track a person using internet, cameras, cell phones, etc. One among them is the cell phone spy software. It is a computer program that can be installed in the mobile phones and it will send information like call logs and messages to the person who installed through internet. One disadvantage is that this software cannot be easily detected by the cell phone user. But there are some tricks to find their presence. One thing is sudden increase in your phone bills. Another sign is the unusual battery drain in your phone. If you face these kinds of problems it is better to be careful and check your cell phone for any kind of stealth software.