Unlocked iPhone 4S working in some T-Mobile USA’s network pockets, Apple smartphone utilizes HSPA+ 1900MHz spectrum

Although T-Mobil USA wrote in the September letter to customers that they were “interested in offering all of our customers a no-compromise iPhone experience,” the fact of the matter remains that the carrier’s network bands are not supported on the iPhone 4S.

T-Mobile’s 14.4 HSDPA (High-Speed Downlink Packet Access) GSM/UMTS network operates on the rather odd 1700/2100MHz frequency bands that are incompatible with iPhone 4S and other UMTS phones supported by standard 850/900/1900/2100MHz bands. However, some unlocked iPhone users are detecting 3G signals on parts of T-Mobile USA’s network utilizing the 1900MHz bands, according to Tmonews.com:

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