Yes, Samsung Galaxy A70 does have an in-display fingerprint scanner.
Yes, Samsung Galaxy A70 does have the face unlock support.
No. Samsung Galaxy A70 has 2 dedicated slots for sim cards and a dedicated MicroSD card slot. Basically, one will be able to use 2 sim cards and a memory card at any time.
Yes, Samsung Galaxy A70 does have fast charging support. It supports 25W of fast charging. The fast charger is also supplied in side the box.
Yes, Samsung Galaxy A70 comes with the fast charger. The mobile comes with 25W fast charger.