Hello Albinosanta, a good step to try would be resetting your "network settings" on your phone. To perform this just go into settings > General management > Reset. Then tap Reset network settings. Please let me know if this helps!
Hey Albinosanta, since nothing is working so far, I would like to look into this issue for you. Can you send me a private message with your account info and the phone number associated with this device so I can investigate? To send a private message, first click on my name "ComcastTito" and then click on "send message".