If this is as common as is it being made out to be, we can stamp FAILURE across our entire system of chinuch (as parents, teachers, rabbonim and community) and look for a new approach.
Why do you think Texting and “half Shabbos” is a problem. I dont think its a Majority, but I do think its a significant minority that feel this way (Otherwise it wouldnt be mentioned many places)
The reason I dont give solutions, is real solutions require thinkng outside the box. Telling some NO YOU CANT is not always the best solutions, the best solutions is give them something ELSE to do hopefully more or at least as appealing.