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Call waiting How do I do
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I've edited your post as this is an English only forum, you can use Google Translate to reply and/or post.
Open the Phone app > menu > settings > additional settings > Call waiting > enable it
Keep in mind that your carrier must offer this option
Hi @هبةشري, let me see if I can help out here.
As @uliwooly mentions, call waiting is enabled using the settings in the phone app.
If you have a Single SIM-device, open the phone app > Tap the three dots in the top right corner > Tap Settings > Tap Calls > Tap Additional settings > Tap Call waiting.
If you have a Dual SIM-device, open the phone app > Tap the three dots in the top right corner > Tap Settings > Tap Calling accounts > tap the name of your service provider > Tap Additional settings > Tap Call waiting.
I hope that helped! 