Both of you aren't really correct. First of all, it is a GSM handset and it's tri-band 900/1800/1900. (Obviously 900/1800 are Euro/Asia bands) T-Mobile's original network was indeed only 1900 until early 2005. Now it's 850/1900 as T-Mobile bought quite a few towers from Cingular when they(Cingular) merged with AT&T. Also, T-Mobile customers can roam on certain other networks' GSM 850 towers free of charge.
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Both of you aren't really correct. First of all, it is a GSM handset and it's tri-band 900/1800/1900. (Obviously 900/1800 are Euro/Asia bands) T-Mobile's original network was indeed only 1900 until early 2005. Now it's 850/1900 as T-Mobile bought quite a few towers from Cingular when they(Cingular) merged with AT&T. Also, T-Mobile customers can roam on certain other networks' GSM 850 towers free of charge.