Phone number not working

My phone number hasn't been working for a few days on iMessage and FaceTime. I am in another country right now, but I've been able to send and receive messages and FaceTime calls for over a month without any problem (not phone calls, because my cellular data is not available here). I have been using purchased portable wifi for this. Suddenly, I can not send or receive messages. I noticed that in all my chats, it is green (like trying to send with SMS), but then the text messages aren't delivered either. I checked my settings, and I can see that my phone number is not connected to my Apple ID, and I tried to add my phone number to the "Send & Receive" section of the Messages settings, but it only has a loading symbol and "Waiting for activation..." under it. But I can't activate it, because I can't get the verification code sent to my phone number! (Doesn't have an option to send to trusted phone number or email). I have Wifi (connection), and this is not happening to my other family members with iPhones, and I have restarted my phone several times and resigned in to my Apple ID, I've allowed SMS sending (still doesn't work though), but none of it has worked. I can't seem to figure out what the problem is, and am worried about not having contact with others! Can someone help please?