In Europe at least, Twitter was unable to come to an agreement with mobile phone operators to continue to send incoming Tweets to mobile phones via SMS, at least one person thinks that SMS is a deceptively profitable service for the network operators. Surely services that use SMS are going to generate more revenue as people pass funny Tweets onto non-Twitter users.
After all, all of those jokes that zip round like wildfire whenever something happens in the news aren’t just the creative juices of the masses expressed in a short message, they are written by the networks to encourage people to send more messages (by passing the jokes on).
All is not lost however, I have been using jTwitter for a long time and it does a great job of keeping me up to date on the move. The Twitter API seems good enough to allow anyone too interface with the service without extensive programming knowledge - I suspect we will see more services that allow access to Twitter from a mobile phone.