Yes, Moto Z2 Play does have VoLTE support, also.
Yes, Moto Z2 Play is a dual sim mobile phone.
No. Moto Z2 Play is not CDMA+GSM. It is GSM+GSM.
You shall get Moto Style Mod free in the box.
Yes, with the help of MicroSD card, you can expand the storage up to 2 TB.