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Recent 3G releases, often denoted 3.5G and 3.75G, also provide mobile broadband access of several Mbit/s to smartphones and mobile modems in laptop computers.
The following standards are typically branded 3G: The above systems and radio interfaces are based on spread spectrum radio transmission technology.
While the GSM EDGE standard ("2.9G"), DECT cordless phones and Mobile Wi MAX standards formally also fulfill the IMT-2000 requirements and are approved as 3G standards by ITU, these are typically not branded 3G, and are based on completely different technologies.
The following common standards comply with the IMT2000/3G standard: While DECT cordless phones and Mobile Wi MAX standards formally also fulfill the IMT-2000 requirements, they are not usually considered due to their rarity and unsuitability for usage with mobile phones.
Each generation is characterized by new frequency bands, higher data rates and non–backward-compatible transmission technology.
The first 3G networks were introduced in 1998 and fourth generation 4G networks in 2008.
Several telecommunications companies market wireless mobile Internet services as 3G, indicating that the advertised service is provided over a 3G wireless network.
The cell phones utilise UMTS in combination with 2G GSM standards and bandwidths, but do not support EDGE.To meet the IMT-2000 standards, a system is required to provide peak data rates of at least 200 kbit/s (about 0.2 Mbit/s).