OTA Update (EL29)

[ChrisH09]

I've seen people talking about this update in other forums...and that it may take up to 10 days for it to be OTA to our phone...but something came up today that caused me to wonder wth is going on. I went to a local gas station to get a pack of cigs (I know, I know) and the cashier saw my phone and told me they have the same phone, but one thing she told me caught me off guard. Her phone already got the EL29 update a few days ago, and she live just a few miles North of me. Why is it that she already got the update but I havn't? Does Sprint go by cell tower location or what? I've never understood how Sprint releases these updates OTA. Does anyone know how it all works, like by phone number, ESN # or what? I wish I could force the update from the update settings menu...istead of having to wait for it.