Title says it all. This requires no contract and no sign up, just buy it. Remember though the 520 is the AT&T version, however it can easily be unlocked to use on T-Mobile. I've done it. Link to article: http://www.bestbuy.com/site/at-t-go...lack/1558441.p?id=1219055522200&skuId=1558441 Note: The 520 supports an external SD card and as of 8.1, you can store apps, music, video on the card, leaving free space on your phone. Enjoy.