I updated my 4 year old Samsung Galaxy S3 phone purchased from ATT with CyanogenMod.
I am very happy with the end result but the journey to upgrade was a learning process. Here is my experience.

Mark Lund's technology blog.
I updated my 4 year old Samsung Galaxy S3 phone purchased from ATT with CyanogenMod.
I am very happy with the end result but the journey to upgrade was a learning process. Here is my experience.