标签:Divices - 英国华人论坛

technology

Global 3G 4G Divices Market Trends Rising At CAGR o

About the 3G/4G Devices MarketAdvanced mobile phone system (AMPS) network technology was used in 1G. AMPS was a voice-only network, operating on the 800 MHz band that was permanently switched off in 1999. AMPS was an old radio technology and...英国华人论坛