what is dual sim for
To transfer the data to another phone, the user just has to take the SIM card out of one phone and insert it in the other. Dual SIM phones are used for a number of purposes, including the following: 1  Two people can share a single phone, each with their own phone number and data stored on separate SIM cards. 2  In a BYOD environment, employees can have their personal numbers and data separate from those for work.