So I bought a AT&T LG G5 unlocked off of eBay believing that I would be able to tether. Set up went fine and my Straight Talk SIM works fine after I changed the APN settings. I went to try to activate my moible hotspot and was greeted by a authenticating screen, and then a message saying that authentication was unsuccessful. It prompted me to go to att.com/mywireless or call 611 to have it activated. I have Straight Talk though, so is there some hack I can do?