This is completely random, but the cellphone forums I've tried are letting me down. Does anyone know how to figure out in advance if a cell phone is capable of recognizing a Group MMS (vs a single one) and replying to all (vs just the original sender)?
It's not specific to carrier or wireless standard (e.g. 3G v1.2 or v1.3) but rather each device. Problem is, I can't check it in the store on demo models because unless you've received a group message you won't have the option.