Getting a java app pre-loaded on non-GPRS phones will be tough. Lots of partnering and even if an app is pre-loaded, users need to be educated. Ofcourse users could download via an app store but for that they need GPRS (catch 22).

From a cost to user perspective – will it cost the user more to use these types of apps via sms or to just get a data plan (or pay per KB if available). It would seem that over time users will get data access rather than send pricey text messages (and then someone still needs to pay for messages from server to user). The apparent target segment (FB, twitter users) are most likely to get data plans earlier than others and hence there is less need for such a SMS browser app.