首先你要有一个美国sprint的账户和号码。
按照提示激活wifi calling
https://www.sprint.com/en/support/solutions/services/faqs-about-wi-fi-calling.html
The Registered Location Information can be updated on your device.
iOS devices: Go to Settings > Phone > Wi-Fi Calling > Update Emergency Address.
Android devices: Go to Settings > Wi-Fi Calling.
然后你就可以收听美国电话了，然后激活google voice