I was testing a T-Mobile SIM on my unlocked AT&T Samsung Galaxy S3 (SGH-I747) when I noticed an H+
near the signal bars! I did a speed test, and everything looks like true. HSPA+ on 1900 MHz, people! This mean iPhone users on T-Mobile will automatically see 3G speeds here!
Of course, this also means that unlocked AT&T and world phones that doesn't have HSPA+ on 1700 MHz AWS radios will now get HSPA+ speeds on T-Mobile!
Check it out!