A.A. meetings take place face-to-face, online and by telephone. Most online meetings use the Zoom app (video and audio) and requires and Meeting ID and passcode. You can dial into any Zoom meeting using your phone (audio only). Usually, a dial-in telphone number is provided along with the meeting details. Any dial-in telephone number provided by Zoom will work. It will ask you for the Meeting ID and passcode.
Another good resource for online meetings is the Online Intergroup.