All the mobile providers crunch images. T Mobile attempt it for all images. It's frustrating when HN page load is delayed because their stupid proxies are struggling to serve the tiny voting button gifs.

I mentioned before the weirdly broken system they use for this too - 1.2.3.9; 1.2.3.11; etc are all annoying IPs to use.

I too am on an "unlimited" account. Unlimited being the normal definition of "has limits" - they'll insert interstitial warnings about fair use limits and they'll stop flash working.