Trustworthy Android implementation ?

[Old_Professor]

I'm looking for a trustworthy and user-friendly 
encryption product to use on my Android smart 
phone.  I found four implementations of GPG. I 
don't know anything about the competence or 
trustworthiness of the implementers.

I'm concerned that if the phone is lost or 
stolen, how much resistance will the GPG 
implementation have to exposing my passphrase or private key.

I found:

APG - Thialfihar
Gnu Privacy Guard -The Guardian Project
OpenKeychain - Dominik Schürmann
PGP SMS lite - woodkick