S5 "not registered on the network" ?

[Dan Lillis]

I recently replace the LCD/Glass on an s5. After closing the phone up, it now says "not registered on the network" Went to ATT, they put a new sim in, no change. I went home, the phone works fine thru my microcell, but not on a cell tower. Any help would be greatly appreciated.
:-\

 

[PainFX]

your phone may have been blacklisted. get ur imei number verified. just a guess.