Which GSM band is best?

Carrier frequencies and bands Carrier3G frequencies4G bandsVerizonCDMA 800, 1900 PCS2, 4, 5, 13*, 66AT&TGSMA/HSPA/HSPA+ 1900 MHz, 850 MHz2, 4, 5, 12*, 14, 17*, 29, 30, 66T-MobileGSM/HSPA/HSPA+ 1900 MHz, 1700/2100 MHz2*, 4*, 5, 12*, 66, 71*Cell Phone Networks, Frequencies & Bands Explained | WhistleOut www.whistleout.com › CellPhones › Guides › cell-phone-networks-and-fre…

GSM is a second-generation (2G ) standard employing time-division multiple-access (TDMA) spectrum-sharing, issued by the European Telecommunications Standards Institute (ETSI).

Reliance Jio uses Bands 3(1800MHz FDD), 5(850MHz FDD) and 40(2300MHz TDD) . Band 40 provides better bandwidth and band 5 provides coverage in remote/rural areas as well as indoors where higher frequency signals cannot penetrate.