Each mobile device works on the wireless network and these networks are divided into different category such as 2G, 3G, 4G further they are subdivided into the category like GSM, UMTS, LTE on different bands.
GSM / HSPA / LTE
2G Network Bands
2G stands for the second-generation wireless telephone network.It works on Standard like GSM, D-AMPS, PDC.2G Networks supports Digital voice services and slow data transmission (2.5G (GPRS) or 2.75G (EDGE) ) but these networks are faster than analog (1G) systems.
GSM 850 / 900 / 1800 / 1900 MHz
3G Network Bands
3G stands for the third generation wireless telephone network in compare of 2G it supports faster data speed, always-on data access, better voice transmission capacity.UMTS,WCDMA, Ev-Do are the main standard of 3G technology.
HSDPA: 850 / 900 / 1700(AWS) / 1900 / 2100 MHz
4G Network Bands
4G stands for the fourth generation of wireless telephone network it is more efficient and faster in terms of data rate, voice transmission and it is very different technology in compare of 3G.The most common standard are LTE (Long Term Evolution) and Mobile WiMAX.
LTE: 1(2100), 2(1900), 3(1800), 4(1700/2100), 5(850), 7(2600), 8(900), 11(1500), 12(700), 13(700), 14(700), 17(700), 18(800), 19(800), 20(800), 21(1500), 25(1900), 26(850), 29(700), 30(2300), 34(2000), 38(2600), 39(1900), 40(2300), 41(2500), 46, 66(1700/2100), 71(600) MHz
SIM Card Type
SIM stands for Subscriber Identity Module which securely stores subscriber's information such as phone numbers and text messages. Users can easily switch SIM card from one mobile set to another. SIM card is responsible for communication among several mobile devices using different kinds of networks such as GSM, UMTS, LTE etc.
Number of SIM Card
Dual SIM Support
Smartphone comes with Single SIM or Dual SIM slot.
Yes with Dual SIM Nano + eSIM support