Because the maximum possible capacity per cell is limited, the power per user decreases as the number of users increases. Once the power for a single user drop too low, it will- and supplies without having- some of it from recharge api another cell. Power of UMTS is always just as high as it should be for a good connection at least. The magic word for mobile telephony and beyond national border's means of time roaming. Roaming is derived from the English word to roam (= walk, wander) from and represents the possibility of using their mobile phones to make calls abroad.

 

The principle is simple: A cell phone from Switzerland abroad automatically logs in to the best quality partner's grid. Immediately, the information on the country and the region in which the phone recharge api is actually sent to that office in Switzerland, in which the phone is registered. Now is an incoming call signal, it sends the headquarters in Switzerland within fractions of a second in the correct region of the country. There, the call signal is passed to those online recharge benefits base station, near which the phone is just. Finally, the base station the signal through to the phone and the call can be received.

The current location of the mobile user registered in Switzerland can be determined only thanks to its entry in the Home Location Register (HLR). Each user is assigned an HLR. Shifts a with his device recharge api to another central area as principal or agent network, the of stay in the Visitor Location Register (VLR) will be transmitted to the appropriate office and stored during the stay. Each Office Mobile (Mobile Switching Center/ MSC) has such a VLR, the 'guests' use and manage. The VLR also comes in roaming use.

 

Without the HLR and VLR available recharge api in the information regarding the customer premises and no roaming agreement with other mobile operators roaming is not possible. Mobile has entered into roaming agreements with over 400 partners in more than 170 countries. Constantly new agreements with other foreign carriers are made. To ensure roaming online recharge benefits requires, inter, also the use of the same frequency bands. In Europe, all GSM networks operate in the same frequency bands.

This is different recharge api in America. To be able to use the GSM in the US, it was decided years ago to use another frequency band (1900 MHz). Other countries, such as South America, set to a frequency band of 850 MHz. Therefore, we now often speak of and, more recently, Quad band phones, which come into the United States for use. These phones can communicate with 850, 900, 1800 and 1900MHz networks. GSM is now the common international standard for digital mobile radio. The system is widely important site used and designed for the transmission of voice. 

 

Network operators have a license that allows you to use the GSM frequencies until 2007. Due to the huge success and the constant demand of the market, the GSM technology will be still used even after 2007. HSCSD is a high performance data recharge api transmission standard for GSM networks: Large amounts of data can be transferred at a reasonable speed and downloads check that from the Internet are up to four times faster than the GSM technology. The maximum transfer online recharge benefits rate of 9.6 is not enough for the mobile exchange of large data volumes. Mobile offers its customers the GSM network since 1993. GSM is supplemented by newer and more efficient data transfer techniques.