My Phone Recieves But Wont Send Messages To Facebook?...?

[Alex]

I have a pretty crappy phone without wifi however facebook notifications are sent to it. It also sends facebook messages to my phone, but when I reply from my phone it doesn't work. Its worked for months and my phone sends texts to normal numbers. I've turned it off and back on. I've gone to the settings on facebook, they're all in order. I've even turned off the settings and turned them back on. Idk why it's doing this and idk what to do to fix it. What can I do??

[cards.phill]

Use a computer.