You can contact an Uber driver directly through the app once a trip has been accepted, but for privacy and security reasons, you cannot see their personal phone number, nor can they see yours. Uber uses a "Safety Number" or "Anonymized Calling" system that routes your call or text through a unique, temporary local number. To reach your driver before pickup, you simply tap the phone or message icon at the bottom of the trip screen. If you choose the "Free Call" option, the app uses your data connection (VoIP) to place the call without revealing any personal details. This connection is only active during the duration of your trip; once the ride is completed, the anonymous link expires to prevent unwanted contact. If you realize you left an item behind after the trip has ended, you must use the "Find Lost Item" feature in the app, which allows Uber to facilitate a temporary connection with the driver so you can coordinate a return. Direct, off-app contact is strictly against Uber's Community Guidelines to ensure the safety and privacy of both riders and drivers.