The most prevalent is UMTS, which is based on WCDMA (the terms WCDMA and UMTS are often used interchangeably). There are several different 3G technology standards. They enable such advanced features as live, streaming video. The high data speeds are possibly the most prominent feature, and certainly the most hyped. 3G is loosely defined, but generally includes high data speeds, always-on data access, and greater voice capacity. GSM introduced the concept of the SIM card (Subscriber Identity Module card) - a detachable smart card that lets users swap their phone number and contacts between handset.ģG - Analog cellular phones were the first generation while digital marked the second generation. The first GSM network went live in 1992 in Finland. GSM - then labelled Groupe Spécial Mobile was originally conceived back in 1982 as a European standard for mobile phones. The widespread use of the GSM standard has made it easy for most mobile phone users to use their phones overseas thanks to roaming agreements between operators using the same GSM standard. GSM is used by about 80% of all mobile phones - approximately 2 billion people across more than 212 countries. GSM stands for Global System for Mobile Communication and is the most popular 2G mobile phone standard in the world. The second form is DSA which means both SIM cards can work at the same time and both receive calls and perform other tasks. The first form of Dual-SIM device is a DSS that requires the user to specify which SIM card is the active and which is placed in standby.

This feature has yet to make a big impact in North America or Europe, but has found increased popularity in Asian markets and is slowly becoming a standard feature. IPS TFT 16M colors 480 x 854 px (4.70″) 208 ppiĬommunication and messaging/data transferĭual-SIM - A Dual-SIM compatible device means that it can carry two SIM cards simultaneously, typically in two different forms.

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