Aircel does not have 3G even here also. Only 2G.
Why don't you compare bsnl coverage with Airtel,Vodafone , idea or Jio. Within few years Jio achieved 91% coverage, Airtel has pretty decent 3G coverage all over India. Bsnl is here much before all telecom came but still almost no 3G coverage, foget 4G and they are talking about 5G. Biggest joke
I think Bsnl service is similar to Aircel,reliance GSM,Tata Docomo not others.But the basic point that I made is BSNL has data based plans which other doesn't.