From DailyTech: Sprint Corp. (S) -- the third largest cellular carrier in the U.S. -- has added support for Wi-Fi calling and HD Voice (wideband audio) for the HTC One M8, the flagship smartphone of Taiwan's HTC Corp. (TPE:2498). The One M8 is one of the top high-end Android phones at Sprint, who (as "Gor-don" would tell you) carries a special "Harman/Kardon Edition" of the device.
Rival budget carrier T-Mobile U.S. Inc. (TMUS) -- the nation's fourth largest carrier -- supported Wi-Fi calling and texting from launch and HD voice from launch. Verizon Wireless (the nation's largest carrier), AT&T, Inc. (the nation's second largest carrier), and Sprint all blocked Android v4.4.3's built-in support for Wi-Fi calling at launch.
The addition of Wi-Fi calling on the Sprint network will be welcome news for some users, especially given Sprint's relatively poor performance (compared to competitors, including T-Mobile) inside tall buildings in urban areas.
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