T-Mobile Hotspot appears to be blocking vita49 data packets

I use my T-Mobile hotspot for an internet link to remote control my radio transceiver.  I can reach the data server that links to my radio and log in.  The log in works until it is time to receive vita49 data packets used to populate the remote radio display.  The data appears to be blocked.  When I connect within my home network, all data is passed and operations are normal.

For those of you that are amateur radio operators, I am speaking of removing my Flex 6500 using Smartlink.

Any comments would be appreciated.

Bob W