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T-Mobile Nokia Lumia 521
The new Nokia Lumia 521 on T-Mobile is an amazing value at only $144 full retail price or $6/month for 24 months. The Windows Phone 8 OS is extremely responsive and since it is a Nokia device there are a ton of software and service options included.
I believe lower cost Windows Phones offer more than old iPhones and cheap Android smartphones and recommend this for T-Mobile customers.