Phones UMTS (maps and data) are very mobile-it was designed to move easily on other UMTS networks (assuming your provider has a roaming agreement). In addition, nearly all UMTS phones (except Japan) are UMTS / GSM dual-mode devices, if a UMTS phone moves outside the coverage of UMTS during a call the call May transparent be transferred to the provision of GSM coverage. The roaming charges are generally significantly higher than the cost of regular use.
Most holders of UMTS licences consider ubiquitous, transparent global roaming an important issue. To ensure a high degree of interoperability, UMTS phones usually several different frequencies in addition to their GSM fallback. Different countries support different frequency bands UMTS - Europe first used 2100MHz while the USA used 1700MHz, and telephone and UMTS network must support a common frequency to work together. Because the frequencies used, the first UMTS phone models designated for USA may not be able to work elsewhere and vice-versa. There are now 11 different frequency combinations used in the world-including the frequencies used only for 2G services.
UMTS phones use a USIM (Universal Subscriber Identity Module) (based on GSM SIM) and also accept mobile phone SIM cards. It is a global standard for identification, and allows a network to identify the phone user to authenticate both local and roaming. The roaming agreements between networks to allow calls to a customer to be redirected to them while roaming and determine services (and prices) available to the user. In addition to the user subscriber information and authentication information, USIM provides storage space for reservations, contact telephone. Devices can store their data on their own memory or on USIM card (which is generally more limited in its repertoire details). A USIM can be moved to another GSM or UMTS phone and the phone on the user details of the USIM, meaning it is the USIM (no telephone), which determines the phone number of phone and billing for calls made from the phone.
Japan was the first country to adopt 3G technology, and the fact that they did not use GSM previously they did not need to build GSM compatibility in their equipment and their 3G handsets were lower than those available elsewhere. In 2002, NTT DoCoMo FOMA 3G network was the first W-CDMA network is the first incompatible with the UMTS standard for radio, but standard USIM cards, ie based on USIM card is possible roaming (transfer of USIM card in a GSM or UMTS phone when travelling). Both NTT and Softbank Mobile (which launched 3G in December 2002) are now using the UMTS standard, PDC and their 2G networks operate in parallel.
Edited and Rewritten from Source: http://en.wikipedia.org
Most holders of UMTS licences consider ubiquitous, transparent global roaming an important issue. To ensure a high degree of interoperability, UMTS phones usually several different frequencies in addition to their GSM fallback. Different countries support different frequency bands UMTS - Europe first used 2100MHz while the USA used 1700MHz, and telephone and UMTS network must support a common frequency to work together. Because the frequencies used, the first UMTS phone models designated for USA may not be able to work elsewhere and vice-versa. There are now 11 different frequency combinations used in the world-including the frequencies used only for 2G services.
UMTS phones use a USIM (Universal Subscriber Identity Module) (based on GSM SIM) and also accept mobile phone SIM cards. It is a global standard for identification, and allows a network to identify the phone user to authenticate both local and roaming. The roaming agreements between networks to allow calls to a customer to be redirected to them while roaming and determine services (and prices) available to the user. In addition to the user subscriber information and authentication information, USIM provides storage space for reservations, contact telephone. Devices can store their data on their own memory or on USIM card (which is generally more limited in its repertoire details). A USIM can be moved to another GSM or UMTS phone and the phone on the user details of the USIM, meaning it is the USIM (no telephone), which determines the phone number of phone and billing for calls made from the phone.
Japan was the first country to adopt 3G technology, and the fact that they did not use GSM previously they did not need to build GSM compatibility in their equipment and their 3G handsets were lower than those available elsewhere. In 2002, NTT DoCoMo FOMA 3G network was the first W-CDMA network is the first incompatible with the UMTS standard for radio, but standard USIM cards, ie based on USIM card is possible roaming (transfer of USIM card in a GSM or UMTS phone when travelling). Both NTT and Softbank Mobile (which launched 3G in December 2002) are now using the UMTS standard, PDC and their 2G networks operate in parallel.
Edited and Rewritten from Source: http://en.wikipedia.org
