While I agree with you, having a globaly routable address doesn't help you if you can't accept incoming tcp/udp connections. My ISP blocks such connections on

While I agree with you, having a globaly routable address doesn't help you if you can't accept incoming tcp/udp connections. My ISP blocks such connections on LTE mobile network. Maybe so you don't pay a lot of money for traffic if people DoS you? It doesn't make sense, since ICMP ping packets are allowed. Well, it's either my ISP or the android phone I have. Does android have any firewalls enabled by default?