2G \u2013 Delivered digital signal and offered up to 250Kbps
speed. Supports voice, text and data services.
3G \u2013 At least 200Kbps up to 3Mbps
speed.
4G \u2013
4G delivers up to 100Mbps for mobile access, and up to 1Gbps for wireless access.
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With 2G you wouldn't be competitive in any real-time gaming nor could you stream HD videos but you can certainly watch YouTube at 144p video quality, browse any web page, use telnet, BBS or any other text-based application. You can also (easily) listen to live streaming audio of even high quality.