Well it's sad to hear that the Lumia 810 is EOL and will be replaced with the smaller Lumia 521. As a WP user (have used a HD7 since 2010) I've been wanting to upgrade to a WP8 with 4G capabilities, but still under the T-Mobile $30 prepaid plan. So I was thinking, which phone is better, the 810 or 521 on T-Mobile. Special note, I only have enough wiggle room for the refurb 810 ($240) or what is looking out to be $200 for the 521. What are your opinions on which phone I should get?