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2. GSM frequency bands - Wikipedia

   en.wikipedia.org/wiki/GSM_frequency_bands

   For example, one version of the Nokia 6340i GAIT phone sold in North America can operate on GSM-1900, GSM-850 and legacy TDMA-1900, TDMA-800, and AMPS-800, making it both multi-mode and multi-band. As a more recent example the Apple iPhone 5 and iPhone 4S support quad-band GSM at 850/900/1800/1900 MHz, quad-band UMTS/HSDPA/HSUPA at 850/900/1900 ...

3. Multi-band device - Wikipedia

   en.wikipedia.org/wiki/Multi-band_device

   Motorola Timeport, the first tri-band mobile phone (1999) A dual band 4G+ router. In telecommunications, a multi-band device (including (2) dual-band, (3) tri-band, (4) quad-band and (5) penta-band devices) is a communication device (especially a mobile phone) that supports multiple radio frequency bands. All devices which have more than one ...

4. Mobile phone feature - Wikipedia

   en.wikipedia.org/wiki/Mobile_phone_feature

   Tri-band means 850 / 1800 / 1900 MHz or 900 / 1800 / 1900 MHz. Quad-band means 850 / 900 / 1800 / 1900 MHz, also called a world phone, since it can work on any GSM network. Multi-band phones have been valuable to enable roaming whereas multi-mode phones helped to introduce WCDMA features without customers having to give up the wide coverage of GSM.

5. Treo 750 - Wikipedia

   en.wikipedia.org/wiki/Treo_750

   In the United States the Treo 750 is available with AT&T, or directly from Palm as an unlocked device. It is also available in: Singapore on StarHub and SingTel; Philippines on Globe Telecom; Italy on 3 Italia; Austria on 3 Networks; Netherlands on KPN; Australia on Telstra and 3; Canada on Rogers Wireless; Mexico on Telcel; UK on Vodafone UK ...

6. Motorola Photon - Wikipedia

   en.wikipedia.org/wiki/Motorola_Photon

   The Photon is an international capable phone ("world phone"), meaning that besides using Sprint's CDMA/EV-DO network and other CDMA networks accessible internationally and through domestic roaming; it accepts a GSM SIM card with quadband GSM and triband UMTS/WCDMA/HSPA+ capabilities.

7. Cellular frequencies - Wikipedia

   en.wikipedia.org/wiki/Cellular_frequencies

   Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones; with such a phone one can travel internationally and use the same handset. This portability is not as extensive with IS-95 phones, however, as IS ...