Why is it that everytime I try and open a text I get a flash sign that says No Callback # Available? How can I get rid of this?

Hi, I think this is probably a completely unrelated problem/solution, but I want to throw it out there just in case. I have a different phone - a Samsung Trance, and I had the same problem. One day, suddenly everytime I viewed a text message, my phone would either call back the number or flash "No Callback # Available", and it drove me nuts since I couldn't view any text message. I also couldn't hear calls or listen to music on my phone. In the end, it ended up being an earphone problem because everything worked again after I plugged in and then unplugged the earphone.

Like I said, my problem is probably unrelated and I apologize if this was not helpful at all, but you could try checking out your earphones and see how it goes.