I have a 4g enable handset. This handset was bought 1 month ago. I recently use 2 4g sim two difference service providers. 1 airtel and others 1 vodafone. both network is full but voda is 200-300Kbps speed when airtel speed same time 900Kbps to 1mbps+ .
Thats proof airtel 4g is best . Others are the worst. East or west airtel 4g is best 4g network in kolkata.