T-Mobile doesnt work but tmo hotspot does

This app doesnt work on my iPhone 6+ w T-Mobile data, but when connected to wifi or even my friends T-Mobile hotspot off her phone, it works. I opened ports on modem and pointed the app to those ports and it still doesnt work. Will be finding another Remote Desktop.

Xlucero505 about Splashtop Personal for iPhone, v2.7.2.1