For the couple weeks until I travel I carry both phones, collecting a bit of data, the odd text message from my mom, snap a few photos, receive an assortment of spam calls, get a few destinations in the maps history, etc. Anything important still happens on my main device (can always tether through the old phone).
By the time I hit the border there’s enough data to not be an immediate red flag, but nothing that really matters. If anyone compromises the phone while I’m away, it’s at least reasonably limited to only collecting data on me until I get back and throw the thing back in a drawer.
It’s not foolproof, but it’s a reasonable balance for me between risk/effort/expense travelling to places like China.
Their eee-ville devices would stay at home. If they needed ee-ville data, they'd download from the cloud, probably into a new device, after passing the border.
No non-idiot criminal or terrorist was going to ever get picked up at the border. It’s the equivalent of getting arrested with 60lbs of pot in your trunk when you got pulled over for speeding through a red light in a car with a burned out headlight.
It’s especially hilarious going though this shit as a Canadian crossing into the US.
Like, if I drove a mile east or west I’d literally have to “off road” my way through a dozen feet of grass and I’d be over the border. I mean, shit, look at places like Point Roberts. Literally crossing some roads moves you between countries. In others the only reason you’ll know you moved between countries is a vaguely angry sign saying if you walk past it it would be illegally entering the US.
The whole thing was only ever going to catch dumb criminals. And yet it’s done well enough that they keep doing it.
Seriously, set up a new phone, new number, new Gmail account, new IG/FB accounts, use them a week before you leave- tell your friends "Follow me here for my trip!" and have your phone number forwawrded. Put a few contacts in it. Done. Not a big deal at all for most technically competent people. That's us, right?
You seem to focus on the technical aspects but really gloss over the entire "create a duplicate online life every time you travel"
I'm far too busy to do that.
Wouldn't they notice all your mail, call list, and other such accounts are from a few days?
No need to bother.
Most companies of any size, and us civil servants, have policies to travel with burner phones/laptops when crossing (even some benign) international boarders and/or entering certain countries.
Frankly, it is so commonplace, it is not remotely suspicious to travel with a burner.