My Photon had WiMax, which is where I showed that Speed Test from. I was in Bridgeport that day, where Wimax exists yet it was slow. Plus, the photobucket mishap coulda been prevented. And even if you upgrade to the 5GB T-Mobile cap and add taxes too, you'll still pay less than Sprint's 140 dollars/month "premium data." While yea the T-Mo GS3, which I have now, isn't considered future proof because of lack of LTE, considering how soon ATT/VZ/Sprint's LTE will be obsolete as LTE-Advanced, which T-Mo is getting, is on the way, I'll take the far and away better battery life on the T-Mo GS3 than on Sprint's GS3 or Photon. And EDGE is still nearly as fast as Sprint 3G. Another big problem with Sprint 3G is all the Virgin/Boost customers on it.Wait, you used a Galaxy S3 on Sprint? You do realize the S3 only has a 3G/LTE radio. It doesn't have Wimax at all. The S2 has 3G/Wimax. What you were testing was 3G. So your assessment isn't even accurate.
On Wimax, speeds are in the 6-8mbps range. LTE speeds in the launch cities (Kansas City, Houston, etc.) are clocking in at 20-25mbps.
Right now Sprint is in the midst of a major network upgrade. That will run through the next year. 3G speeds have gotten very wonky in the process. I'm feeling the pain too. I gave up my WiMax S2 for a future-proof S3. LTE gets switched on in my area end of this month. In the meantime, I'm suffering with crappy 3G speeds (500kbps). My bet is that I'll end up getting better service and paying less as a reward for my patience. I don't lose voice or texting abilities, just the full multimedia immersion.
On the flip side I blew through my T-Mobile cap in one day when the Photobucket app stupidly tried uploading all the video on my phone. Now I've been reduced to Edge speeds (which clock in at an unusable 15kbps) until the clock resets. Still better than suffering an overage fee from Verizon, I guess.