God Eater Burst

[LapFox]

hi guys I have few question about port forwarding.
I just tried to play GEB(God Eater Burst) with my friend in hamachi adhoc.
And we can see the team of each other, but when we just press the start, then
it just freeze little bit and get some networking error like host got massage "an networking error was occurred", and other got time out.
So I tried to get in coldbird.net, and my friend could see the team that other made,
but I didn't. So I concluded that I have to get some DMZsetting.

Im using the mobile hotspot, and there has No DMZ setting and just only port forwarding. I thought DMZ just open every port, so I maybe it same that open coldbird port in port forwarding. But I don't know what is the port of coldbird. And also I tried just open every port like 1025 to 65534. And it just makes the internet slowly.
So my question is here
1. my mobile hotspot model is USCC SCH-LC11 (samsung) anyone have this model and have DMZ setting?
2. What can I do with port forwarding to play the god eater burst.
what can I do with this damn thing,,, help me!