Your text message cannot be sent

[PoBD]

I've been having this same issue, I have a X and I'm on Verizon. I get "National access coverage not available" and then several notifications that the txt/pix were not sent. I've tried battery pulls, *228, clearing the mem/cache...and I still almost always get it when I send mms, I have to resend around 10 times to get it to go.