I use a Tracfone to make and receive calls and to check e-mail. Nothing else. Recently, I have been unable to access my mail. I go through the process but when it gets to the Yahoo main page, I see an image of a lock superimposed over the symbol of the Earth that indicates I'm connected to the WWW. At that point the screen no longer responds and I can't do anything. I've done everything I can think of to resolve this issue but can't fix it. I can sign into my Yahoo account from any device except my cell phone. Any suggestions?