dual sim slots
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Galaxy A20s (SM-A2070) Galaxy A20s (SM-A207F/DS 32GB) Dual-SIM Dual-SIM Standby - Call active on one sim card (dedicated slot) Dual-SIM Standby - Call active ...
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By connecting a hybrid dual SIM adapter to the slot, all the three roles (two SIM card and memory card slots) can be utilized.
Hybrid Dual-SIM Slots: A Good or a Bad Thing? » YugaTech | Philippines ...
Nano SIM: Nano to nano. SIM-Extender is suitable for dual SIM smartphones and tablets which have an hybrid dual sim slot.
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So, in essence, a hybrid dual-SIM phone can function as either a dual-SIM phone or a single-SIM phone with an external storage slot.