It is a great way to spy on somebody who or whose behavior seems suspicious and track his/her activities remotely. Well, by learning how to clone a phone number, you basically get access to others’ calls, messages, and other smartphone activities. Many of you might be wondering as to why one needs to clone the number of another phone. In this article, we will learn two ways to clone a phone number and a unique way to intercept and spy on another smartphone and its activities. Since every SIM has a unique number, every phone has a different number. Phone numbers are associated with the SIM inserted in the phone.