I'm looking into buying a Lumia 521 for my sister and was curious about warranty coverage. I plan on buying a T-Mobile locked 521 and using it with Simple Mobile($25 talk and text, no data plan) as the provider. If I needed warranty support would I contact Nokia directly? I know I can't go to T-Mobile as they would say that by not being on a T-Mobile plan that the phone isn't covered by them. Also any common issues to watch out for on the 521? I'm trying to decide between buying the 521 and the 710 (not too concerned about the differences between WP7.5 and WP8)
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