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Cingular getting better
That I cannot answer. There is no technical reason it cannot, AT&T owns plenty of spectrum and has more than enough tower leases.
The original problem was that while ATTWS and Cingular used the same protocol and frequencies, the tower equipment was different and incompatible. the Cingular tower equipment was actually newer and able to support more people in the same bandwidth (a.k.a. cheaper for the company) which is why Cingular GSM phones defaulted to Cingular towers, even though it may have been getting a better/stronger signal from an ATTWS (which was owned and operated by the same company).
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