In countries where dual SIM phones are the norm, people who require only one SIM leave the second SIM slot empty. Dual SIMs are popular for separating personal and business calls, in locations where lower prices apply to calls between clients of the same provider, where a single network may lack comprehensive coverage, and for travel across national and regional borders. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support for keeping both connections in a "standby" state for automatic switching, or have two transceivers to maintain both network connections at once.ĭual SIM phones are mainstream in many countries where phones are normally sold unlocked. Some mobile phones support use of two SIM cards, described as dual SIM operation. A Lenovo smartphone with two SIM card slots. It uses Nano-SIM instead of the normal sized SIM. Mobile phone with two SIM cards A modern Samsung Galaxy phone with two SIM card slots.
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