S.S.
We have tried many different types of phones since my son was 8. We landed on iPhone, but he is now 15. What I will recommend is buying second-hand and see how responsible he is with it. My son has been through 10-12 phones while I have had 2. The data thing is a huge issue. Kids do not understand that watching a movie or video on Youtube just sucks the data. Snapchat and texting pics also are data sucks. My son ran me $250 in data charges because he didn't know and AT&T didn't and doesn't have data limits that you can set.
Good luck!
S.