VeraCrypt is a fork of TrueCrypt that’s still maintained.
Matthew Crumley

VeraCrypt is certainly the way to go. For an iPhone without a decoy option, the safest method would be to wipe the phone and store an iTunes backup of it in a hidden operating system ( This would be trivial to restore again after you are through the border.

Audited recently too and a number of vulnerabilities fixed:

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