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Since T-Mobile is being cagey (likely for regulatory reasons) about the locations of its re-farmed, iPhone-compatible HSPA+ network, a group at Airportal.de has filled us in. The 3G/4G locales are submitted by iPhone 3G and newer owners (or non-AWS 4G phone users) who are seeing 3G/4G on T-Mobile. T-Mobile claims its HSPA+ network shows speeds up to 70 percent higher than AT&T’s network.

The map appears to be filling out and goes way beyond T-Mobile’s stated Las Vegas, Seattle, Washington, DC, and New York metro area rollouts. We first discovered T-Mobile’s 1900MHz network at Moscone center in San Francisco ahead of WWDC this year.