Yes, Micromax Bharat 3 is a 4G mobile phone.
Yes, Micromax Bharat 3 does have the OTG support.
Yes, you can use Micromax Bharat 3 as a Wi-Fi hotspot, too.
Yes, Micromax Bharat 3 does have the front camera LED flash.
Yes, Micromax Bharat 3 does support the VoLTE.