Google官方的訊息：
https://support.google.com/hangouts/answer/6079055?p=android_first_minute&rd=1
Almost all calls to the US and Canada are free from all countries where
Hangouts calling is available.
例外狀況：A few US and Canadian destinations will cost
USD 0.01 per minute depending on the specific phone number.
剛在Google Play 下載"Hangouts Dialer " APP 撥打美國電話，超過一分鐘，沒計費。
如果有撥打美國、加拿大的朋友可以試試看，感覺很讚的服務
--
客服省錢APP！ 撥電話免聽長串語音
http://youtu.be/SMQF_gPm5qQ
--
https://support.google.com/hangouts/answer/6079055?p=android_first_minute&rd=1
Almost all calls to the US and Canada are free from all countries where
Hangouts calling is available.
例外狀況：A few US and Canadian destinations will cost
USD 0.01 per minute depending on the specific phone number.
剛在Google Play 下載"Hangouts Dialer " APP 撥打美國電話，超過一分鐘，沒計費。
如果有撥打美國、加拿大的朋友可以試試看，感覺很讚的服務
--
客服省錢APP！ 撥電話免聽長串語音
http://youtu.be/SMQF_gPm5qQ
--
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