In most respects, I've been
really happy with T-Mobile since
I switched in April. I pay much less for service through T-Mobile than I
did through either AT&T or Verizon, and on the odd occasion I've
had to contact their customer service (only twice so far), I've been
left feeling better than I did any time I ever had to contact their
competitors. However, T-Mobile shares one flaw with those other
services: their coverage
sucks inside my house. That's why I want
Wi-Fi Calling. It's a feature that T-Mobile has on several of its Android and Windows Phone handsets, but it
isn't available on the iPhone. At least not yet.
The case for Wi-Fi Calling
I live in an area well outside the city where cell tower coverage can
be spotty. Most of the time, driving around, it's not a big deal, but
when you get to the entrance to my subdivision, geography and distance
from towers makes it tough for cell signals to penetrate. It's no
different with any of the "big four" carriers - they
all stink in my neighborhood.
When I was an AT&T customer, it got so bad that AT&T ended up
sending me a "Micro-Cell" - a small cell base station that connected to
my cable modem, routing calls over the Internet instead of relying on a
cell tower. In my house I had four full bars of coverage. It was great.
But AT&T is
expensive. And their customer service has left me wanting on more than one occasion.
But that's only for AT&T. And it also requires extra hardware to
attach to your cable modem. Also, my Micro-Cell was finicky. I had to
reset it a few times. And doing so required me to log in to AT&T's
web site. It was just a lot of work.
T-Mobile used to offer a similar product called the
Cel-Fi. They've suspended that program, but Cel-Fi still sells them direct for $575.
How it works
T-Mobile has gone a different direction. Instead, they've embraced a
technology called UMA, or Unlicensed Mobile Access. The principal is the
same: your voice and data are transmitted over a broadband connection,
creating a "virtual" GSM connection over the Internet, through your
cable modem. The difference is that you're not relying on a small base
station to do it. It's working through software alone.
This also helps shore up one of the single biggest issues with
T-Mobile in general - the radio frequencies its towers use aren't great
at permeating solid structures like buildings. At least, they're not as
good as the radio frequency spectrum licensed to AT&T. So it helps
them shore up coverage where you might be in a building that has a Wi-Fi
hotspot you can use.
It's a nifty trick. And through T-Mobile, it's a feature the company
calls "Wi-Fi Calling." If you stop into a T-Mobile store or a mall
kiosk, you'll find that several of the Android phones, BlackBerrys
(while they remain) and even the Nokia Windows Phones on display, all
support the feature. The iPhone still doesn't. It's not just T-Mobile,
either - Apple simply hasn't activated a UMA feature on the iPhone,
anywhere.
UMA isn't something that's
unique to T-Mobile. Orange uses it in the UK. It's used elsewhere also. It's not widespread, but it's not totally uncommon, either.
But why not FaceTime or Skype?
There is certainly no shortage of ways to initiate voice communication over IP using the iPhone. Skype is one obvious way; FaceTime Audio works too. There are other VoIP apps you can download as well.
But they're all fundamentally different than UMA, because none of
them - with the exception of FaceTime, and even then, only for
other FaceTime users - are linked with your handset phone number.
Wi-Fi Calling is, and it's seamless. If you're on a Wi-Fi network,
you can make or receive a call. Your handset is just as useful indoors
as it is outdoors. It just works.
So why doesn't Apple support UMA on the iPhone?
I'd love to know the answer to that question. To the best of my
knowledge, Apple's never stated its opinion on UMA one way or the other.
I'm unaware of any particular security issues that would make an iPhone
running UMA susceptible to problems.
T-Mobile is the only carrier in the U.S. that supports UMA, and
Apple's relationship with T-Mobile is still fairly new. And while the
iPhone has made a positive contribution to T-Mobile's subscriber base,
T-Mobile is still the smallest of any of the "big four," so I suspect
their influence with Apple is still fairly minor.
In all likelihood, Apple hasn't added Wi-Fi Calling to the iPhone simply because it really doesn't
need to in order to sell the iPhone. Apple's not in the habit of making a lot of carrier-specific concessions.
Regardless, Wi-Fi Calling is a truly useful feature, and it's
something that helps the iPhone's competitors differentiate themselves.
For those of us who have decided to go with T-Mobile because of cost
savings, fast LTE or simply because they're
not who we were doing business with before, Wi-Fi Calling would be a fantastic feature. I hope Apple allows it on the iPhone.
In the interim, I'm getting used to it being pretty quiet around the house. Though I
do have to spend a lot of time responding to voicemails when I leave.
Maybe I'm being myopic by expecting Apple to make up for a
shortcoming in my carrier's coverage area. But this problem isn't unique
to
my carrier, and I know I'm not alone. A
lot of us
suffer from crappy cell service either at home or at work - wouldn't it
be nice to have four full bars wherever you have a decent Wi-Fi signal?