Yes, Moto Z2 Play is a dual sim mobile phone.
Yes, Moto Z2 Play works perfectly fine with the Jio sim.
Yes, it does support International 4G sim cards.
Yes, Moto Z2 Play does have VoLTE support, also.
Yes, Moto Z2 Play does have the memory card slot.
I was using Moto Z2 earlier but had lost it and then I have purchased this phone. It is very nice built phone and gives you excellent grip. Camera is good and battery performance is also quite good. It lasts for almost a day to me with very heavy usage of Jio sim card. One can definitely buy this phone for sure.
This is my second motorola phone and first purchase from OnlyMobiles.com - I got better deal of 5% instant discount which was not available on flipkart so I have purchased from onlymobiles. My experience with OnlyMobiles is good and I will recommend others also.
Coming back to the phone, I have used Motorola Z Play earlier but I have lost that phone. So I had purchased this phone. It is a good upgrade and phone navigation is quite smooth and fast. Phone does not have any kind of heating issue. However, compared to Moto Z Play, they have reduced the battery capacity. Overall, It is a good phone.