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Disclaimer: This post is only for educational purpose. We are not responsible for any wrong way use of this post. Cloning of a GSM phone is achieved by cloning the SIM card contained within, but not necessarily any of the phone's internal data. GSM phones do not have ESN or MIN, only an International Mobile Station Equipment Identity (IMEI) number. Our cellphones are working on two network such as: GSM and CDMA. Both these network offers good call quality and other technical features which separates both network from each other. However CDMA network are more vulnerable to sim cloning than GSM network. In CDMA(code division multiple access) mobile phones cloning is achieved by changing the Electronic Serial Number(ESN) with the help of special software’s. The Electronic Serial Number(ESN) is usually transmitted to the telecom company to authenticate any cellphone/ device onto the network. By modifying Electronic Serial Number (ESN),Preferred Roaming List(PRL)