DualSim card phones are those that can allow two sim-cards with different phone numbers to be used on a single phone. There are two types of dual-sim card phones. The simple one is that it takes two sim cards, but at each time, you can only use one phone number, and u need to manually switch between sim-cards. The more powerful dual-sim phones allow both phone number work simultaneously. No switch is needed. These are usually called dual-sim dual-wait phones.
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