I activated my iPhone on the Boost network yesterday and am unable to send text messages. I can receive text messages and can make and receive phone calls. Notice there was an IOS update yesterday, that didn't fix the problem. I have tried soft resetting, doing the service update software and nothing is resolving my issue.
So sorry to hear about this experience, DeadlyKitten211. We want to help! Can you please let us know if this is happening when you try to text Android users only?