Two SIM cards can be used simultaneously by mobile devices thanks to dual SIM technology. Travelers who need to use a local SIM card while keeping their home number or people who want to keep work and personal communications separate will find this feature convenienslots 101 yonot as it enables users to keep two different phone numbers and service plans on a single device. Due to its versatility and usefulness for users who manage several phone numbers and plans, dual SIM technology has become more and more popular in recent years. Dual SIM technology works by allowing the device to connect to two different mobile networks at the same time by having two distinct SIM card slots. It also lets users choose which SIM card to use for data connections and make and receive calls & messages on both numbers.