How to install, remove SIM / USIM card in Samsung phone?
Dual SIM models: Insert the SIM or USIM card with the gold-coloured contacts facing downwards.
Insert the primary SIM or USIM card into SIM card slot 1 and the secondary SIM or USIM card into SIM card slot 2
• Do not insert a memory card into the SIM card slot. If a memory card happens to be lodged in the SIM card slot, take the device to a Samsung Service Centre to remove the memory card
• Insert the SIM or USIM card provided by the mobile telephone service provider.
For dual SIM models, you can insert two SIM or USIM cards so you can have two phone numbers or service providers for a single device. In some areas, data transfer speeds may be slower if two SIM cards are inserted in the device than when one SIM card is inserted
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