I bought a used samsung keyboard phone a few days ago from Cricket. I already have everything paid for and it was working great until yesterday. I tried texting a few people but it keeps saying "connection error" and I have no idea why, I was texting these people the day before. Also, I can still make calls and go online with the phone, I just can't text. Anyone have any idea what to do?

Side note, I called support and they were honestly no help at all. And again, to clarify in case anyone did not get in the info above, everything IS paid for, I bought it not even a week ago and it was working fine until yesterday. I've also taken out the battery several times, still nothing.