Your Spice M-6120 does not support Whatsapp and Gmail as the phone comes loaded with proprietary OS from Spice, which does not support the popular extensions of Android, iOS and Windows OS. The phone comes with an openable back cover and you can insert the SIM card there. It comes with a 5 inch display having HD display. The phone lacks the camera power as it has a 1.3 MP rear camera. It comes with a 1300 mAh battery and an expandable storage capacity of 16 GB. You can download Java applications as the phone supports Java.