Nokia 521 is probably the best low cost smartphone out there, period. The addition of 720p resolution, FFC, rear camera flash, and 1GB RAM would have made this phone almost top tier at a budget price. For example 521 sells routinely for $69 to $79. They could easily sell the fine tuned 630 for $99 to $129 and it would basically grab a huge chunk of market share because not everybody wants a top tier phone at a top tier price. The 630 would have given so many people a premium experience at a budget price (something Google is trying to do with Moto G and Nexus 5) and Apple lamely tried with the iPhone 5c or by continuing to sell iPhone 4S. This tweaked 630 would dominate sales not only in the US on T-Mo/MetroPCS/ATT but only do really well in Europe, Asia, Australia and Latin America.
What a lost opportunity!