Twitter and Jaiku do not _run_ on cell phones. You do not have to install anything to use them. They use SMS gateway which anyone can setup (if you have $50K+ a month to pay for the traffic, that is). My post was about apps which you have to _install_ on a phone! There's a huge difference between the two approaches.
I'm counting SMS/MMS/ivr apps (82ask, twitter, radar, 411 free), mobile apps(jaiku,gmail) and mobile web (cant think of any :S) all as mobile startups.
I've noticed that most of the popular, succesful mobile startups use just sms/mms and a counterpart web site currently. Perhaps we shall see them 'evolve' as the years pass as mobile apps and then mobile web become familiar to 'regular' mobile users. Users will look back at the day you had to remember text commands and shortcodes just like we now look back at the command prompt.
For now I agree, apps are a pain and you should stick to the most well know interface of sms when you can. The 'fun' stuff needs apps but the chance of success is a lot lower currently.
Twitter and Jaiku do not _run_ on cell phones. You do not have to install anything to use them. They use SMS gateway which anyone can setup (if you have $50K+ a month to pay for the traffic, that is). My post was about apps which you have to _install_ on a phone! There's a huge difference between the two approaches.