You can connect your Android phone to Acer C202i Projector through wired connection, which is USB cable; or through wireless way，which is via App. Acer C202i Projector allows users to plug and play the media. Check out the detailted steps.
(1) Select the Android on main menu of projector, and then select Plug and Play menu by pressing OK key.
(2) Download and install EZCast app from Google Play Store or scan the OR code shown on screen.
(3) Connect your mobile to the projector via mobile USB charging cable, and then enable “USB Tetherlng in Setting of your mobile.
(4) Enable EZCast app and select “Beam-XXXX to enjoy your projection.
Related post:
How to Update Acer C202i Projector Firmware?
Acer C202i Projector WiFi Connection Tip
Acer C202i Projector Quick Setup Guideline