To change which camera is being used you just need to go into the camera and hit the switch icon (usually two arrows curving around towards each other).
If that doesn't work, try restarting (turning the phone off and back on) and then try switching.
To change which camera is being used you just need to go into the camera and hit the switch icon (usually two arrows curving around towards each other).
If that doesn't work, try restarting (turning the phone off and back on) and then try switching.