The four major cellular carriers support Wi-Fi calling, below are links to cellular carrier Wi-Fi calling FAQs.
- Verizon Wireless: https://www.verizonwireless.com/support/wifi-calling-faqs/
- ATT Mobility: https://www.att.com/shop/wireless/features/wifi-calling.html
- Sprint: https://www.sprint.com/en/support/solutions/services/faqs-about-wi-fi-calling.html
- T-Mobile: https://support.t-mobile.com/docs/DOC-1680
Note: Cellular carrier use of Wi-Fi calling while roaming in building or between floors is not just dependent on Wi-Fi coverage but the cellular carrier technology to maintain calls as your devices jumps from one Wi-Fi AP to the other. The same is true for Wi-Fi AP to a cellular tower. Your calling experience will vary.
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