ACE - Expert
GUIDE TO ANDROID LOLLIPOP UPDATES IF YOU'RE NOT AN AT&T CUSTOMER!
If you're not an AT&T customer you will not get updates since you are not connected to the AT&T network. AT&T is checking the IMEI of the phone through the cell network before telling the device to update. Here is a list of phone OEM's and if there is a work around...
(For those in the USA, if you have a friend that has AT&T service, put their SIM card in the phone and it will update).