ISM band

Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz) , and are usually referred to as tri-band and quad-band phones, or world phones; with such a phone one can travel internationally and use the same handset.

3G Frequency Bands Carriers:Network:3G Bands and Frequencies:U.S. CellularCDMA850 MHz: Band 5 1900 MHz: Band 2Cricket WirelessGSM/UMTS/HSPA+850 MHz: Band 5 1900 MHz: Band 2Boost MobileCDMA800 MHz: Band 10 1900 MHz: Band 2Metro by T-MobileGSM/UMTS/HSPA+1900 MHz: Band 2 1700/2100 MHz: Band 4Cell Phone Frequency Bands by Provider – Wilson Amplifiers www.wilsonamplifiers.com › blog › frequencies-by-provider

Subsequently, the 3GPP developed third-generation (3G) UMTS standards, followed by the fourth-generation (4G) LTE Advanced and the fifth-generation 5G standards, which do not form part of the ETSI GSM standard. “GSM” is a trade mark owned by the GSM Association. … GSM. IndustrytelecommunicationWebsitewww.gsma.comGSM – Wikipedia en.wikipedia.org › wiki › GSM