Thank you very much for your response. I have unlimited texting. I made no changes to my plan. The numbers I am texting are short codes, like for Coca Cola. I have been able to do this in the past, it's just the last few months that I've had a problem with. I can do some but with others it's as if they never received them, because I get no response. I check and it says message has been sent. I also did the things you suggested - removing my battery and dialing *228 and neither one of those worked.