For some reason my phone will only send multimedia messages, even when they only contain text. Sometimes, it will change for a few messages to regular messaging (with just text), but then it will return to only sending multimedia messages.
I can't find any reason for this to happen. As a result, my messages are often delayed by several hours before they are received by the phone I texted to. Once again, I am not putting any multimedia in the messages. Just text, but they keep being sent as multimedia messages.