These days every telecom company along with a network provider is bringing a combo offer like this one. Here you get the phone with BSNL , which they think will compete with JIO. This is a feature phone with dual sim, keypad, 4G, 2000 mAh battery, 4gb internal storage with expandable upto 32gb, 512 mb RAM, 2mp rear and 0.3mp front camera, dual sim.
I will suggest to buy jio for its network connectivity and offers.