Does anyone know of an up-to-date source for recommended frame size and data rate for mobile web? I've been using Sorenson Mainconcept 264 with rates between 1200 kbps and 300 kbps and frame sizes between 640x360 down to 480x288 These all play fine on a Samsung Moment and an Iphone. My concern is that the higher data rate resulted in a 10 meg file- it looks good, but download times seem too long.
I think the problem you're seeing may be related to the fact that 3G speeds are all over the place depending on carrier. Some people might be stuck on Edge and others might have so called 4G service soon.