So my cell service is through Verizon, but my hotspot in my Sierra runs off of AT&T. When I lose cell service (Verizon) but still have 5 bars of WIFI, my phone won't connect/ run off the WIFI. My spot is active and work but always says connected via "google". So why won't my AT&T hotspot in my truck work when I don't have a Verizon cell signal??? Why won't my phone automatically go to or stay on the hotspot if I lose the Verizon signal??