No. Gionee X1 has 2 dedicated slots for the Sim cards and one dedicated slot for the memory card. You can expand phone memory by up to 256GB with the help of the MicroSD card.
No. Despite of having huge 3000 mAh battery, Gionee X1 has not reported any heating issue during our review.
Yes, Gionee X1 does have a LED flash for the selfie camera.
Yes, with the help of App Clone functionality, you can use 2 WhatsApp accounts in Gionee X1 at the same time.