i have never used uber - but trying to sign up with my info - i recd message that my cell number which i have for over 20 years, said that the number has already been used! Uber's telephone number is "not in use" what can I do!!

Reset pasword or call customer service

Is better you go there in Daly City and clarify this. Sure that they will help you to clear the used number. It could be a mistake of someone.

Right !

Go to the West Lake site, and speak with CS!

Try resetting the password