When joining a service from your mobile device, you will need to choose an option on how to receive audio, otherwise you won’t hear the audio at all.
Your options are: "Wi-fi or Cellular Data” or "call in."
Generally, you’ll want to choose “Wi-fi or Cellular Data,” which will use your internet connection or data. The "Dial in" option would be used if you want to call in via your phone line. If you choose that option, Zoom will give you a phone number to call in order to hear the audio. This could be useful if you don’t have an internet connection and want to use your phone line instead. However, as we mentioned, “Wi-fi or Cellular Data” is the recommended option.