sos

My phone says sos, and I can't turn cellular on at all. Before this happened my phone kept saying no sim. I've tried restarting my phone multiple times, I've tired resetting network settings, and I've tried contacting my provider but I can't call because I can't recieve them or make them. I can't even get in contact with a agent because i need a code sent to me and I can't even receive messages or send them. So is there anything else I can do?