Three way calling / multi-conference call function requires network and / or SIM card support. If your SIM card isn’t activated, the phone will show a message “Unable to conference calls” when you try to use it. Please contact your service provider to enable multi-conference call service for your SIM card.
Why couldn’t I use three way calling / multi-conference call function? Why does it say “Unable to conference calls” when I use conference call function?
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