This is a weird one! I occasionally fire up personal hotspot on my phone or iPad to tether my laptop. This works great, but... If I turn on hotspot on the iPhone, the iPad will join the hotspot. If I turn on hotspot on the iPad, the iPhone will join the hotspot. Since it's a Wifi hotspot, it then proceeds to do things like upload all the photos I've taken to Photostream, wasting my data plan. This is bizarre behavior because I never joined one device's hotspot from the other! This would be pointless as they both have cellular data. Also, if I "Forget" the network, it eventually gets "remembered" again somehow. Has anyone ever seen this bizarre behavior? I can work around by making sure Wifi is off on the "other" device, but I shouldn't have to! Why the heck are the devices joining each other's networks when I NEVER TOLD THEM TO?