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 / WCDM / FDD-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.
Yes Support GSM 850, GSM 900, GSM 1800, GSM 1900
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.
Yes Support HSDPA 850, HSDPA 900, HSDPA 1900, HSDPA 2100
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.
Yes Support LTE 700, LTE 1900, LTE 900, LTE 1700, LTE 850, LTE 2600, LTE 1800, LTE 800, LTE 2100, LTE 2300, LTE 2500
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.
Dual SIM Support
Smartphone comes with Single SIM or Dual SIM slot.
Yes Dual Micro, Dual Standby