My internet provider is xplornet and they told me that no port can be opened for my connection. On their web site, it's mentioned :
"If you're on a 4G satellite system, try not to hard code a DNS or port forwarding. Xplornet's servers can override it, and it could complicate troubleshooting."
Does it mean that I cannot use freephoneline ?

I was trying freephoneline with the software (version 3.2.7.0) juts to see if I can make it work before going further with the unlock key and number porting. I opened a ticket but the "fongo support" closed it saying they do not provide support for freephoneline.
Any help would be appreciated,
Thanks !