Pros: Great dislpay, fast, excellent signal reception. Good sound, I found Windows Phone relatively easy to use. I was impressed by the quality of the phone considering the purchase price.

Cons: T-Mobile pay as you go plan. No data included, and voice is .10/minute, texts are .10 each after the basic half-hour voice/text allotment is used. Purchasing data access is expensive. I'd recommend buying the unlocked version of the phone or going with a carrier who has better plans. Not familiar with contract plans, but the phone can be signed up for one.

Pros: Price

Cons: None I can think of at the moment

Other Thoughts: This is a good budget phone, bang per buck ratio is quite favorable.

Pros: The phone is comfortable in the hand, call quality is great, Here+ Maps are very handy, integration with OneDrive works very well, makes backing up photos easy.

Cons: T-Mobile.

T-Mobile won't upgrade their existing Lumia Phones (521 and 925) to the Cyan firmware, which means that those phones don't get WP 8.1. They never upgraded the earlier 810 model to the Black firmware. The Denim firmware is due for release by the end of the year, and going by past behavior there's no reason to believe that T-Mobile will change their tune now and release that update for new 635 customers.

Other Thoughts: If you're just interested in checking Windows Phone out, you can get this model cheaper from Cricket. They're as bad as T-Mobile when it comes to firmware upgrades, but your upfront investment is lower.

Pros: nice features, good maps gps works well, Cortana is nice

Cons: unpredictably locks up won't call out or receive calls, can't text out or recieve

Pros: Fast LTE, TMobile WiFi Calling, fast CPU, international LTE band support (untested), low cost to replace if stolen/broken/failure, micro SD support.

Cons: 512MB memory, no flash, no front camera, fewer apps in store, disappointing results from Bing and Cortana compared to Android and iOS.

Other Thoughts: Very pleased with phone's value prop. Will be buying 3rd and recommending. SpeedTest.Net showed LTE download speeds as high as 125Mbps, so far. WiFi calling is a game changer and TMobile's router is tops. The phone is generally fast with occasional slowdowns.

Pros: - LTE capable!
- 4-band GSM, can be used for foreign travel
- fast and responsive
- nice design
- downloadable maps

Cons: - doesn't have all the bells & whistles, what a shock for an economy phone :-) (the real shock is what it does include)

Other Thoughts: Excellent price for LTE phone, when on sale. Really good response time. Nice simple design. Vivid display. Windows store has improved a lot, and contains the apps I need. I like the downloadable maps with Here & Here+. Included 8GB internal storage is adequate and can easily be expanded with a Micro SDHC (or SDXC) card. Potential buyers need to decide if Windows Phone 8.1 is for them, this a great phone to try it out. Can you tell I like this phone?

Pros: CORTANA - way better than SIRI, call quality, 4G LTE coverage (lots with this phone) almost every where I go. 4.5 inch screen (very nice color/brightness)

The phone will take SELFIES, uses a sensor on the back facing camera (when using Nokia GLAM), takes excellent photos, very fast and snappy phone, best phone i've ever owned for the $$, Nokia makes excellent devices. I'm a moderate smart phone user (using for 3 days I was still at 34% battery)

Cons: None

Other Thoughts: This phone is amazing running on T-Mobiles network

** FASTER Than my previous 2 iPhones ** apple has great stuff and I love my iPad. The Windows 8.1 with CORTANA, in my honest opinion is so much faster, easier and smoother than IOS interface. For the $$, if Apple is going to want to stay in the game they'll have to LOWER their prices.

very fast, snappy, smooth interface with no lagging at all (windows 8.1 is excellent flowing and smooth)
expandable SD Card slot up to 128gb.
8 gig on this phone is plenty (when adding SD Memory)
Keep in mind with the 8.1 update this phone places any APPS, Music, Photos, Documents etc... on the SD memory, that's right Apps go right to SD Memory (if you add an SD)

Pros: Cortana blows Siri away! The quad-core processor is very smooth. NO SELFIES.

Cons: Only 512 mb ram (causes lag if more than 1 app is open), screen is a major fingerprint magnet, no flash on camera (knew it going in though), App store.

Other Thoughts: My phone is actually for AT&T but I'm sure performance is the same. You really can't beat this as an entry level smart phone. I paid $99 so if something were to happen it would be no big deal. App store is lacking. Seriously.