Any charge for receiving forwarded calls to Google Voice number in Hangouts app overseas?


    I travel to Asia , Australia and Europe frequently. I have found possible forwarding T-Mobile number to Google Voice number (both California numbers) and I can receive forwarded calls at Hangouts app using Wi-Fi or LTE/4G. Will I incur any T-Mobile charge if I use Hangouts to pick up forwarded calls in Asia, Australia and Europe? Thanks for your answers.

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