When the user of a smartphone loses his/her case, and subsequent texting is performed with the fragile exterior of the phone exposed, he or she is engaged in unprotected text.
Person A: "Dude, my iPhone case cracked. I'm now having unprotected text."
Person B: "What's that?"
Person A: "You're an idiot."
The text version of "drunk dialing", in which you text someone while under the influence of drugs or alcohol. The resulting texts are often composed without a filter between the fingers and the brain. As such, unprotected sex often leads to situations that are, at best, uncomfortable.
Dude 1: Dude, how did Emily end up dating such a troll?
Dude 2: She met him on myspace, man, and they started having unprotected text. Next thing you know, she can't get rid of him...
Dude 1: Woah...we should totally get high...