Last week, protestors of the Republican National Convention co-ordinated their movements using the smartmobbing application txtmob — which would broadcast insto-updates on where the action was happening. Everything was working fun until halfway through the event, when smses suddenly stopped going through. Congestion? Entirely likely, though the txtmob folks now claim that T-Mobile actually blocked txtmob messages. From a message sent to participants:

As many of you are aware, T-Mobile blocked TXTmob messages during a portion of the RNC. While we won’t speculate on the reasons for this action, it would be extremely helpful if the hundreds of customers who were unable to receive TXTMob messages called T-Mobile to complain. Be sure to explain that TXTMob is an opt-in service that you have chosen to join, and to encourage their representatives to contact admin@txtmob.com if they have any questions.

(Thanks to Smartmobs for this one!)