I'm pretty sure all AT&T iPhones pull carrier configurations that set attwifi hotspots as a trusted auto-joined wifi network. I reset my iPhone the other day w

I'm pretty sure all AT&T iPhones pull carrier configurations that set attwifi hotspots as a trusted auto-joined wifi network. I reset my iPhone the other day without restoring any backup. Later that day I found my phone connected to attwifi without any instructions from me.