Time to take his phone and change the accounts. Wish I could find the people doing this to him, they'd regret the day they were born.
Ironically, my father just got the USPS scam text my daughter got. They are having a good laugh.
Much easier said than done. I'd have to wrestle it out of his baseball mitts for hands. He grew up on a farm and is still plenty strong and stubborn. My wife caught a glance at his phone for a second and he was texting someone with 3 hearts next to their name. He is around 70. And given the last set of gift cards was for Sephora, I'm guessing that there is more going on here than just a simple 'prize delivery' scam. Who knows how many people are ripping him off at this point.
Next time he sets it down to charge, my wife is going to get me to take him out on an errand and get him away for it for a few minutes so we can see what is going on.