Can someone please tell me how it works

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I have a phone that only has one sim card but this here has two. Any ideas why? Also, I wondering if this particular phone takes rogers sim card. I tried contacting the seller but no response.

Any info on these type of phone would be great.

Thanks in advance!!

I typed in "dual sim" on eBay, seems like you can switch between 2 providers, or you can switch between cards with phone on, Perhaps more. Would think you could also double your memory.