gateways don't help when you're a mobile user. which is why I have little snitch on my mac... I'm not _always_ going to be using my laptop at home- and that's increasingly true for my mobile phone which is almost never left home.
I won't buy a phone that doesn't have that feature.
Of course its ideal to not send the packets and waste the battery at all but when that's not an option, I'd rather use a firewall to block the traffic rather then just let it through, regardless of the hit to the battery due to it constantly retrying the blocked connection.
i still have one question in a forum about why Android browser's ignore etc/hosts, and every now and then (question is 6 years old) people comment how shocked they are to discover that is the case (still!)
Or feature? I'd love a firewall rule that could block any traffic that contains my contact list. Wouldn't be possible even if the traffic wasn't encrypted...
Maybe scatter a few of these contacts through the alphabet to catch apps sending in batches.
As responsible developers they wouldn't want to send your entire address book across the wire in the clear, would they? Why, someone could easily listen in and then you would have no privacy! /sarcasm.
To make it harder to write an ad blocker