The options to call or text your driver appear in the white bar at the bottom of your screen once you've been matched.
There is a phone icon and a message input box in the white bar where the driver's name and vehicle information appear.
To call your driver:
Single-tap, then double-tap the round phone icon under your driver's information
Single-tap, then double-tap the phone number or the "FREE CALL" button
Your phone will automatically call your driver according to the option you’ve chosen
Message your drivers
Single-tap, then double-tap the text field under your driver's information
Type or speak your message
Single-tap, then-double tap the "SEND" button