You first need to see if Replicant supports your phone: http://redmine.replicant.us/projects/replicant/wiki#Replicant-Status

If not, install CyanogenMod (without the Google Apps) and F-Droid (a free software repository): http://beta.download.cyanogenmod.org/install

CyanogenMod does include proprietary drivers but it is still much better than the Android OS you got in the first place. For more information: https://fsfe.org/campaigns/android/android.en.html

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