Need info on BSNL DataOne modem

hotshot05

Skilled
I know that the difference between the Type-I/II modem and Type-III/IV modem is that the former only has ethernet and USB connectivity while the latter has Wi-Fi along with ethernet and USB.

What I want to know is what is the difference between Type-III and Type-IV modem? They cost the same and have the same connectivity. So where is the difference?

Also what is the difference between the Type-I and Type-II modem? I think the Type-II has 4 ethernet ports compared to only 1 on the Type-I. But is it the only difference?
 
They are no longer providing type 3 and 4 modems in Bangalore Circle.

Type II has wifi and 4 ports, type 1 has no wifi for sure. Not sure about number of ports.
 
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