i still able to access to any devices in 192.168.1.0/24 and i am sure there is no active session in firewall connectionDid you already have a session open to your 3g web page? It works as expected for me.
/ip firewall filter add action=drop chain=forward dst-address=192.168.1.0/24 src-address=10.0.0.0/24Code: Select all
/ip firewall filter add action=drop chain=forward dst-address=192.168.1.0/24 src-address=10.0.0.0/24
try to ping your devices in your modem areaI thought hotspot isolated it's network from your main LAN anyway.
Please post an export with more information.