I've been with T-Mobile for a long time, so porting my number out wasn't a decision I made without giving it a great deal of thought. The things I considered were:
The Good:
- Call Quality
Overall, T-Mobile's call quality is good, with very few dropped calls.
- Price
T-Mobile's voice plans have always been very reasonable, which accounts for them being known as "the value carrier".
- Customer Service
Their customer service has been second to none. I've experienced very few issues, and have rarely had to call them, but when I did, hold times were short, reps were courteous, and the issue/question was resolved quickly.
- UMA Calling
This is a great feature, which allows voice calls to be placed via wi-fi when in range of a wireless network. It solves the "no signal in my building/house" problem.
The Bad:
- Data/3G
T-Mobile has been rolling out 3G service for some time now, but despite my area (Philadelphia suburbs) being among the areas with 3G service, there just aren't enough towers to provide 3G service where I live and work. In fact, through all the years I've been with T-Mobile, even an EDGE data connection isn't consistent. T-Mobile's rolling out a lot of nice devices, but using them for data on GPRS or (maybe) EDGE just doesn't cut it these days.
- UMA Calling
Hey, wasn't that listed as a "good" thing? Yes, but unfortunately, T-Mobile chooses to put UMA calling only on either the very low-end phones, or BlackBerry devices. There's a whole range of devices (including even the most recent Sidekick) that would benefit greatly from having UMA functionality, but it's not there.
- Customer Service
Yes, it too is on the good list, and as far as their reps are concerned, it's true. Over time though, account management via the web page has been spotty at best. Continual down-time due to "improvements" is frustrating.
Why I Left:
Ultimately, it was because of their inferior data network. With data plan prices that now rival "the big guys", T-Mobile needs to ensure that 3G coverage is not just "rolled out", but that it adequately saturates the regions into which it's been deployed.
Where did I go with the number I ported? Sprint. Having had a SERO (deeply discounted Sprint Employee Referral Offer deal) plan for over a year now, I've found that their call quality is good, dropped calls are few and far between, and their data network is second to none. Is their customer service any good? Yes. In fact, the few times I've had to contact them, I've had no issues at all. And, though Sprint has no UMA Calling feature, signal penetration where I live/work is very good, so for me, it hasn't been necessary.
So, T-Mobile, if you're going to offer nice phones with great data dependent features, and charge as much for the data plans (or nearly so) as the other carriers, you need a network to back it up. I've waited long enough.