They also know the model of device you have, its retail price, and possibly what cellular carrier you have.
They've also got your e-mail address, which has some predictive value for income. And access to your contacts, which likely includes the names / e-mail addresses / mailing addresses / phone numbers of people with which you interact. If you have an entry for yourself with your address, they can probably know your home's value and whether or not you're listed as an owner.
With enough cross-referencing between users, I imagine they could get a reasonably good guess.
I'm on iOS and signed up for Uber long before the privacy scandals went mainstream. iOS would have required that I be prompted for access to contacts, but I don't remember what the justification was.
I do know it knows where "Home" and "Work" are without me explicitly telling it. I assumed I'd be able to type in the name of a contact and it'd resolve that to the contact's address I have listed (an actual valid use case), but I just tried that and it didn't work. So I don't know OTOH what valid justification they have for using it.
I do see if you go to invite friends (for "free rides"), it allows you to connect contacts to send codes to. I don't think that's how I got prompted, though.
They've also got your e-mail address, which has some predictive value for income. And access to your contacts, which likely includes the names / e-mail addresses / mailing addresses / phone numbers of people with which you interact. If you have an entry for yourself with your address, they can probably know your home's value and whether or not you're listed as an owner.
With enough cross-referencing between users, I imagine they could get a reasonably good guess.