This wikiHow teaches you how to turn on Dial Assist, a feature will help you easily call your United States-based iPhone contacts while traveling abroad.
Open your iPhone’s Settings. It’s the app on your home screen noted by a gray gear icon.
Scroll down and tap Phone. It’s in the fifth group of settings.
Slide the “Dial Assist” switch to the On position. The switch will turn green, which indicates that Dial Assist is on. When you call a US-based contact, your current country's exit code and the number “1” will appear before the number, making the call go through without error. If the switch was already green, Dial Assist was already turned on and there’s no need to make any changes.
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