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If you are wondering why it costs $50 more than the carrier charges off contract, you will be happy to know that T-Mobile will add a free $50 refill card to your purchase.
The $50 unlimited plan which T-Mobile offers will buy you unlimited talk, text and
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The Nokia Lumia 710 for T-Mobile is a mid range smartphone which features a 3.7-inch ClearBlack WVGA touch display, 5 megapixel camera capable of 720p HD video and is powered by a 1.4 GHz processor. The device is available in Black and White and has an assortment of colored back covers to choose from for personalization.
source – WPCentral