Cannot send text msg? | Phone/Device Issues and Features | Consumer forum

I rarely send text msg, and tried today to send one, but it always ends up failing. The bar scrolls almost to the end when it tries to send (saying sending), but then fails just near the end. Data works fine and I've had it running on SO for about 6mnths with no issue. I'm using a JB iPhone 3G (locked to Rogers), are there any obvious settings I can check?

I have tried texting to my wife's SO iPhone 3G and it fails as well when trying to send the text.