I lost my phone, and had some sensitive details in my sms. No lock as this has never happened because i keep my phone on a lanyard around my neck, though still dumb. I really just need to know when the message was deleted if there is some sort of history to track. If I can figure out the date of the info being deleted, I can be sure it was not shared with anyone. I’m bombarded with text traffic everyday, so I can’t fully remember.