Also consider Australians who travel and return home. I have personally had my phone searched 3 times. I know many people who also have the same experience. One time I refused and let them keep the phone, just bought a new iPhone and restored it. Since then I was searched almost every time I went through the airport.

After refusing to hand over the code (Politely... I explained that no, there is no terrorism material or similar on my phone, I just object to this practice, which they could not comprehend) I was treated pretty aggressively, had my whole body searched (not strip searched, but groped very well all over), all my luggage taken apart etc.