I have been trying to sign up for cellular on my iPad, but having tried once and had the signal drop in the middle, my iPad does not acknowledge thqt i do not have service.... Hiw do i sign up so i have coverwge when i travel, even though there is ni coverage in my residential area, and how do i convince iPad that i do not have an axcount and need to begin again. I have tried retrieving passwords in all of my addresses, but nothing ever comes, so i know that i do not have an account.