I can send texts but i do not receive the responses from many of those who either reply or send me a direct text.
I found out that it is only when someone with an I phone sends a text. They will need to go into their settings and turn off "I message" then after they send you a text they can turn it back on. They should do it... I have no problems now...
Hope this helps..
My phone is doing the exact same thing.. If you get this figured out please E-Mail me.