Mainstream users won't ever refer to a tutorial to send email.
Mobile is usually more challenging than desktop.
On Android you can use K9 Mail [1] with your email and it will automatically decrypt PGP messages using keys within APG [2].
Re:Poll: Do you encrypt your email?
by mike-cardwell on Monday July 15, 2013 @01:20PM
(#6047000)
K-9 mail still only works with inline PGP though, not with PGP/MIME. K-9 Mail is so close to being the perfect mobile email client IMO. Open source, decent UI, fast, fully featured, but it's half-finished PGP implementation is so frustrating.
Also, APG it's self still lacks a bunch of features, and it seems to have been abandoned.
I want a Firefox OS phone, but until there is an email client which supports PGP, it will be useless to me.
Mobile PGP. So frustrating.
User studies of PGP:
Why Johnny Can’t Encrypt: A Usability Evaluation of PGP 5.0 (http://www.gaudior.net/alma/johnny.pdf)
Why Johnny Still Can't Encrypt: Evaluating the Usability of Email Encryption Software (http://cups.cs.cmu.edu/soups/2006/posters/sheng-poster_abstr...)