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Unless, of course, you use T-Mobile's Wi-Fi calling service.
Fun fact: T-Mobile has a service called "Wi-Fi calling." Have you ever heard of it? Wi-Fi calling was originally launched as "Hot Spot @ Home" in 2007 by T-Mobile as a bid to compete with the landline.
After Hot Spot @ Home launched in 2007 to little fanfare, as a monthly landline-killer, two things happened to vindicate T-Mobile's strategy: T-Mobile remains the lone major proponent of Wi-Fi calling in the US, despite the fact that UMA is an open standard (which AT&T, as the other GSM carrier in the US, could easily implement), and the fact that there was a CDMA version of UMA in the works as far back as 2005.
But even T-Mobile is a little bashful in promoting its service, confirming to me that the feature would "never" be a top-line of an ad campaign.
Meanwhile, on the other side of town, is Republic Wireless.
Republic is a new MVNO (mobile virtual network operator) from the folks at Bandwidth.com, which rents its cellular network from Sprint, but whose main goal is to teach the world to Wi-Fi call.
Instead of routing your voice call directly through the internet, a femtocell device pretends to be a real cell tower, which captures your phone calls and then... Cost is a bit of a crapshoot: if you don't wrangle a freebie from a kind customer service rep, some of the carriers will actually charge you for the device — which can be as much as 0.
While the difficulty of UMA implementation, or the lack of a finalized CDMA alternative to UMA, might've worked as an excuse before, Vo LTE means the excuses are running out.
Many people I've spoken to were unaware that T-Mobile offered the service until they actually started using their device — and now find they can't live without it.
It's refreshing that the carrier is taking the issue of in-home calling seriously, but there seems to be a limit to how far it's willing to go, and how indispensable it's willing to make Wi-Fi.
Once calls on Verizon and AT&T are made over Vo LTE, there's little stopping them from being re-routed over Wi-Fi as well, at the mere flip of a switch.
The day a carrier offers me an LTE femtocell is the day I weep for a cellular radiation-riddled humanity.
Now even T-Mobile is offering a femtocell fallback, which serves as another ringing non-endorsement of UMA.