Do you mean you want to cover the entire roof on the outside? and if so, what are you trying to accomplish?
What do you mean saying "mobile phone" ? Trailer ??
Ann: it appears you can buy them online
She has a mobile (or manufactured), home, not a travel trailer. Different abode.
Cover your roof for what reason? Do you need a new roof?
My husband helped a friend cover the roof of his elderly mother's home. They put tin over the existing roof and a top cap. It does not leak anymore and the tin looks great. You can get it in several colors.