One of the features I found appealing about the Samsung Galaxy S II line was the fact that - with an OTG adapter cable - it could connect to USB thumb drives. Unfortunately, I didn't pursue this before purchase and I've discovered that - intentionally or inadvertently - the Sprint edition has this feature disabled. I'm still very happy with the phone generally and I can work around this - but I would like to ask Ting to do whatever they can to address this. (If I have to wait for Ice Cream Sandwich, so be it.)
One thing I did notice is that in Settings > Storage, much of the internal storage of the phone shows up as "USB Storage" instead of "Device memory" and I suspect this may have something to do with it - if the phone already "thinks" it has a USB storage device attached, another one may not be possible.