If you’re unsure whether Call Waiting is enabled or not, dial *#43# to find out. A message will appear on your phone screen telling you if it is enabled.
If you have subscribed to Videotron’s Voicemail service, the call will go to voicemail if you ignore it. If you have not subscribed to Voicemail, your second caller will hear a busy signal.
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Note that the procedure for a three-way call is the same for Apple and Android phones.