In case people were worrying about LE or (worse) your spouse spying on your texting, you should use an iPhone and iMessage.  The Feds are complaining that they can't spy on texts from iMessage.  See:

http://techcrunch.com/2013/04/04/apples-imessage-encryption-impossible-to-intercept-for-surveillance-purposes-claims-dea-report/

As long as you delete the messages from the phone, apparently, nobody can ever read them!

Sy