Hi, if anyone can help me I would really apprecaite it...Long story short, I live in the middle of nowhere with extremely poor wired internet access (fibre, cable etc).  The speeds are so slow I can barley watch a SD YouTube video.  However, I can get a strong 4G signal in my house.  I have just purchased a Sim with Three Network for unlimted data and popped it into a MR200.  The speeds I'm getting are great (about 50mb/s) incredible jump in performance for me.  However the problem begins when I try to game on my Xbox One.  When i connect it to the wifi, everything is fine but i get a strict NAT type and a message saying I have a double NAT.  The only device supplying internet is the MR200, i have nothing connected to it, just the sim card in the back.

From reading online I think the problem is that the sim has a nat of its own and the MR200 is using one too.  I am not technically minded at all and most material online for this issue is for people connecting to other routers etc.  

Basically what I am wondering is how I can resolve the issue myself wihout having to port everything I want to use.  Is it possible that a different 4G/LTE router would not cause this issue? 

Thanks in advance for anyone taking the time to read and reply :)