Hello! I was calling to 1-800-937-8997 from Dubai and was talking about 30 mins. Will I be charged for that?
Unless you were on WiFi Calling, you will probably be charged. The correct number for international roaming support is +1-505-998-3793. Which is free from a T-Mobile phone anywhere in the world.
https://www.t-mobile.com/support/coverage/international-roaming-checklist
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