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Friday, October 14, 2011

Cell Phone Frequency

Most premium mobile phones on the market today support four frequency bands for 2G – 850/900/1800/1900 MHz. This provides nearly global coverage. Japan and Korea are notable exceptions as they don’t have 2G GSM networks. For 3G, 2100 MHz is nearly globally accepted except for the U.S. 3G in the U.S. is divided by carrier (ATT – 850/1900 MHz, T-Mobile – 1700 MHz). In some countries additional frequencies are available to improve network capacity.

Let’s take the Dell Venue Smartphone as a specific example. Venue has two base product versions from the frequency band support perspective:

1.Version One has the following:

  • 2G support: 850/900/1800/1900 MHz (GSM/GPRS/EDGE)
  • 3G support (WCDMA): 850/1900/2100
  • This version supports quad-band 2G and 2100 3G, therefore it has largely global capability in either 2G or 3G. It also supports the 850/1900 MHZ bands required by AT&T in the US. This version would be recommended for consumers with AT&T service.

2.Version Two has the following:

  • 2G support: 850/900/1800/1900 MHz (GSM/GPRS/EDGE)
  • 3G support (WCDMA): 900/1700/2100 (1700 is also known as the AWS band)
  • This version also supports quad-band 2G and 2100 3G, therefore it has largely global capability in either 2G or 3G. It also supports the 1700 MHZ bands required by T-Mobile in the US. This version would be recommended for consumers with T-Mobile service.

In summary

AT&T 3G 850/1900

T-Mobile 3G 1700/2100

 

Source

http://www.dell.com/content/topics/segtopic.aspx/landing/locked_unlocked_phones?c=us&cs=04&l=en&s=bsd

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