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It is better not to call the passengers immediately after taking the trip in order to find out the address of the trip and the method of payment in order to cancel the trip in case something did not fit the driver. This is prohibited by Uber rules. And the risk of running into the passenger's complaint is quite high.
The driver can be disconnected from Uber in the following cases: non-compliance with traffic rules, including overdue documents for the car or driving license, serious traffic violations, unsafe driving; insecurity in the trip. For example, speeding, using a mobile phone without a holder, driving a red light.