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Cell phone cloning is a technique in which secure data from a cell phone is transferred to another phone. The other cell phone becomes the exact replica of the original cell phone as a clone. As a result, while calls can be made from and received by both phones, only the legitimate subscriber is billed as the service provider's network does not have a way to differentiate between the legitimate phone and the "cloned" phone. The cloner can set the options to ring your phone when you make a call and you will have no idea that the cloner is listening from his own cell. He can read the text message, phone book entries, look at photos, etc. You can also dial phone numbers from your phone and much more. Although communication channels are equipped with security algorithms, however, cloners are released with the help of loops in systems. So when one gets huge bills, chances are the phone is being cloned. Millions of cell phone users, whether GSM or CDMA, run the risk of having their phones cloned.