2nd phone, same problem - hot spot only works properly when on a call. Like the phone signal is helping the hotspot signal stay connected. Stops connecting with network after 20 seconds when not on a call. Turning off hot spot + turning it back on helps it reconnect, but lasts only 20 seconds. ATT is of no help, other than finally sending another phone - which has the same problem. Same situation no matter what device is connected to the hotspot.