I have a weird problem... On my old phone (unlocked iPhone), I subscribed to news and weather updates via SMS from a local radio station. The shortcode is 411923. Then I got Nexus One (same T-Mobile service and SIM) and still receive the messages from them. Well, one day, there was a big news day (chile earthquake?) and I was getting annoyed by them, so I was gonna reply with "STOP" like you do with most short codes. The Nexus absolutely refuses to even attempt to send this number a text. It won't even try. It immediately shows the "message failed <!>" notification and sound. I can send to various other shortcodes, but this and a few others, the Nexus won't try. I am sure I could get another T-Mobile phone and swap SIMs to do it from that phone... I am just wondering what is the problem?