Unable to access YouTube, IG, NetFlix on mobile data

Yes! This was the fix for us. Turns out the webguard was improperly turned on by a rep, even after I explicitly said "…please don't initiate any blocks." It took 2nd tier tech service like 30 seconds to discover this for me. They were able to tell me exactly when it was turned "on" by one of their customer service reps, then looked at 8-month-old chat records and saw I had said "please don't initiate." I was (still am) so upset. After I pitched a fit, they gave us a small amount of credit since it was 100% their error. Doesn't make up for the hours and hours we spent at Apple and T-Mobile stores, no one being able to figure it out. Not to mention, SO much arguing and frustration with my teen. He was convinced we were punishing him by blocking this 3rd party data. 

If you are having this issue, don't waste time at the stores! Try the method described in the post above Or call and check if any parent webguards are unknowingly active.