The only problem with buying unlocked is finding a phone that supports the T-Mobile bands, or you'll only get edge. I do know that T-Mobile didn't release the black update, and I find it hard to ever buy a Nokia again. I hope Sony makes a WP phone.
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Why did you turn anti-Nokia? If I remember correctly you've owned a lot of WP devices on T-Mobile that ended up getting abandoned. Both HTC and Nokia, but as you can tell, my tendency is to blame the carrier and not the OEM. Especially when there is such a freaking history of it with T-Mobile... I liked my HTC HD7, and I would love the styling if HTC came out with a HTC One type WP device, but at the end of the day I think I prefer Nokia's build quality rather than HTC. I do think that HTC is doing the right thing with their guarantee of support for two years, I think that's past due and should be an industry wide standard.
As far as Sony is concerned, I do own some Sony devices and have a certain trust in them. However their not exactly doing gangbusters themselves, they've spun off their PC division and I think they have or may spin off their TV division shortly. I'd have to check that, but their TV division is not doing super well either. God only knows how long they will be making phones. I wish Sony all the best, but Samsung and LG are hammering them.
EDIT- finally I'd have to say that jumping to Android in order to avoid missing out on updates is rather problematic. It's pretty much only the Nexus and Google Play devices that one can be sure will be updated. On the other hand, it is true that Android is significantly more feature mature than WP. However WP is advancing, and there's just no way in hell I am going to give up on WP at this time.
Come back..... come back to WP. the water's fine and getting warmer.... Come back....