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Legally it's a bit mixed.
They have a right to search inside anything you are carrying... i.e. a bad, a suitcase... and this is the right that they extend to "things that can contain things", meaning computers and phones. You're on thin ice if you want to be the Supreme Court case against this... if you're not a US citizen it is not a good idea to refuse.
They do not have a right to anything not contained in what you are carrying... i.e. they can't search your home because you are at a border, and likewise with cloud service stuff, like email or app data that isn't presently on your phone they have no right to this... but if would be retrieved by your phone then it's back into the "stuff you are carrying" box.
They also have an absolute right to your identity, meaning your fingerprint should they ask. So they can get you to unlock you phone if this is enabled.
But they don't have the right to things in your head, i.e. a passphrase. So you could argue against it... but again, this is thin ice.
What this all boils down to is: Don't keep things in your phone that you don't want to be accessed, and either don't have apps installed or clear caches (log out of apps) and knobble internet connectivity during travel.
You can reinstall whatever you please once you're at your hotel/wherever.
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Velocio
I'm going there in May for TABR.
I want all my maps and stuff on the phone - it's a backup for my GPS.
I tweet, but could I just remove the twitter client and be done with it?
Do they have any rights to emails or anything else on the phone?
Should I remove Tor from my phone? There's nothing dodgy on there but I wonder if they'd see it as a red flag?