You have the option of adding a tip in the app after the ride is completed, at the same time as when you're asked to rate the driver. Whatever you tip them is added on to the total for the ride and it's paid for by the same payment method you linked in the app.
Does this mean you have to have your phone's cellular data turned on when you're in the car? (I'm just hazarding a guess that the Uber app won't function without internet access.)
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