I noticed that sometimes there's quite a bit of unsolicited traffic coming to my public ip address while on 3G, like udp packets from random addresses and some weird traffic from Google servers. I'm not that concerned about the security implications but all the port-unreachable replies etc. can really kill the battery because the 3G modem can't stay in power-saving mode.

The blame goes mainly to the crappy firewall of my carrier that let's pretty much all traffic trough on the high ports, but I doubt there's anything I can do about that. I created an iptables rule that drops all incoming udp traffic which seems to help a little with the battery consumption, but our version of iptables doesn't seem to support stateful packet inspection so I don't know if we can do anything about tcp packets.

Any thoughts on this? Or should I just yell at my carrier?