GL-Inet m300 share data

Hey together,
I am currently in Panama and I have a local SIM-Card with unlimited data’s.
My big problem is, that the data’s are only unlimited for the use with my phone, the shared data’s are very limited.
I am not sure how the simcard is knowing how I use the data’s.
I have read, that the TTL will maybe be the point, so I have add the follow code to my Firewall - Custom Rules
“iptables -t mangle -I POSTROUTING 1 -j TTL --ttl-set 65”
If I try to ping a website with the cmd so I see that the ttl is now by 65,
but my data’s will also be capitulated as share data’s.

Can please somebody help me here?
Best regards