I recently purchased a used Lumia 521 for my son, as his previous phone went through the wash. He does not have a data plan, and must rely on wifi do access the app store, etc (which is the way his mother and I want it). What I find interesting is his phone does not appear to have any of the Nokia specific settings or configuration options like Nokia account, Audio, network +, etc. I compared his to both my parents 521's (all on the same carrier) and the versions for the OS / Firmware all appear to be the same, they have these options but his does not.