Yes, you can use 2 sim cards and 1 memory card at the same time in Micromax Canvas Infinity.
No. Micromax Canvas Infinity has 2 dedicated sim cards slots and 1 dedicated slot for the MicroSD card.
Apart from the mobile phone, you shall get battery, earphone, usb cable, usb power adapter, user manual, screen guard and a free back cover in the Micromax Canvas Infinity box.
Yes, you can change fonts in Micromax Canvas Infinity.
No. You will get normal charger only in the box. However, you can use Sony CP-AD2 charger to charge it much faster than the original charger.