Hi all, I'm just wondering If I bought an unlocked Lumia 920 on ebay lets say. Switched my AT&T GoPhone sim from my 520 (On the At&T $60 a month no contract plan, 2gb data included) Will it work?? In the suggested GDR3 and 8.1 updates.. The 520 will be lacking in features. I really don't want that.. but I basically only have AT&T gophone as my only choice for a company. No one else around in my area has a better deal for GOOD service. Thank you!