AT&T subsidiary Cricket Wireless are now offering the Nokia Lumia 630 for free on contact.
The deal does require a mail-in rebate and the $50 is delivered via a Cricket Visa Promotional card, but it does deliver the handset at a price more commensurate with its specs.
Of note is that while the handset is being advertised as 4G, it is in fact not the LTE version of the device, but HSDPA. The handset is only available in Bright Green.
To take advantage of the deal, read more at Cricket Wireless here.