GSM was the first successful mobile network (2G) allowing voice calls and SMS. However, data speeds were slow at 13kbps, prompting improved 2.5G networks. 3G significantly increased speeds to 200kbps, enabling faster internet, video streaming, and video calls. 4G networks launched in 2009 in Scandinavia and by 2012 were widely available, providing speeds up to 50Mbps for instantly loading large webpages and sharing HD files. Faster mobile connectivity continues revolutionizing internet access.