Just a warning for people sending an SMS message to multiple people on iPhone.
When you send a SMS message to more than one person the message sends as an MMS.
I have tested this on both my iPhone and a friends (both iPhone 3G). I'm not sure if this is the same for iPhone 3GS.
Basically this means that when you send a bulk text like the 37 person one I sent when I moved it doesn't fall under your text plan, so this cost me $7.40
Anyone else noticed this?