I must have done something. All of a sudden now, my wifi gets turned off and I get the message that no cellular network can be found. I bet that I clicked the wrong thing on a pop up from Verizon asking me to sign up. The top left corner of the screen looks different also. It used to say Verizon and it's gone now. I just want it to stop! I'm not ready to sign up now. What can I do?