Lumia 640 dual sim, and when people call me it says ''unknown caller''
I have a Lumia 640 dual sim, and when people call me from a landline or a mobile, it says ''unknown caller''. When people call me with Whatsapp, then I recognize the caller. How to fix this error?
Currently, there is only a sim in one slot, not in the other one. All contacts are saved on the memory card.
I have a Lumia 640 dual sim, and when people call me from a landline or a mobile, it says ''unknown caller''. When people call me with Whatsapp, then I recognize the caller. How to fix this error?
Currently, there is only a sim in one slot, not in the other one. All contacts are saved on the memory card.
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