It is not always that these equipments are used by professional investigators, but it can also be used by anyone with a purpose. One of such devices is the cell phone. Cellphones are a necessity today. Almost all of us have it today. Hence, it becomes really very easy to spy using this device. Now, these spy cellphones come either as a separate equipment or is in-built in a cellphone. Can be ideal to track any one. What happens is, the person who is spying will call on an alternate number which connects to a bug inside the cellphone, and once this happens you can easily listen to the person you are spying on.