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AT&T (previously Cingular)
AT&T uses both 800 and 1900 MHz frequency bands for their GSM network data and voice services. Therefore, it is important to ascertain which frequency AT&T is putting into use in your area.
Our Advice
AT&T's complex network infrastructure utilizes both 800 and 1900 MHz frequencies. Therefore, the most simple solution is to opt for a dual band cellular repeater, which will always work with the AT&T Network. Try the following dual band repeaters:
Dual band repeater kits for all voice and broadband coverage nationwide
However, in most cases we have found that AT&T uses the 800 MHz band for voice services, so you can be reasonably assured that 800 MHz repeater will in fact work despite the AT&T Network complexities. If you wish to try this, bear in mind that we offer a money-back guarantee on our repeater kits, so if the 800 MHz product fails to work you can try the 1900 MHz model or simply have your money returned to you. Exceptions to this are North Carolina and South Carolina which use 1900 MHz cellular signals. Furthermore, AT&T generally uses the 1900 MHz frequency band for its HSDPA/UMTS broadband data service (for both cell phones and broadband data cards) so a 1900 MHz will generally be sufficient for this service.
But, this is true, just not sure how long it will be though. According to an article in our paper, AT&T runs at a different frequency so T-Mobile phones will become bricks (eventually).
AT&T agrees that it plans to shift T-Mobile customers to a new frequency, and that the move will require T-Mobile customers to get new phones. But AT&T said the shift would be stretched out over several years, so customers could replace their phones at the same time they normally would."