[fatdog]

What kind of mobile filesystem wipers and SIM wipers are available?

I use Signal for txts, and while I believe it does not store plaintext txts on the SIM card (haven't analyzed it), SSDs strew cleartext data all over the place. Border guards using a disk imager like EnCase or something similar would get significant fragments of browser and communications history.

Key thing is if you have an iPhone, don't use TouchID, or as I call it, "Apple Bad Touch," because they can just hold you down and run your finger over it.

It's best to travel with a burner. Maybe we need a cyanogenmod image that includes a "duress key" like TC had, and old RSA tokens, but if there is anything on your phone that could be used against people you know, don't take it across borders.