INFORMATION TECHNOLOGY 1G,2G,3G & 4G Best Explanation & Comparision Posted on 05/01/202105/01/2021 by apho2018 01 May This Video explains the all the telecommunication technology in best way i.e. 1G,2G,3G and 4G. apho2018 SSLC |Physics| Focus Area Based |Quick Revision | Chapters 1 & 2| Malayalam Local and standard time l Physical Geography for NDA/NA/CDS/CAPF l Class – 05 l Prateek Sir