Be aware of Opera Mini Geo Location
Don’t trust your GEO location data within Google Analytics via Opera Mini browser. [valid until 12/2016]
Opera use own servers that sends a compressed version on to the mobile device.
I tried connect to my site via Opera Mini browser one month ago. My real location was Czech Republic — Prague and GA displayed Kenya location.
The most used GEO loacation via Opera Mini
I have probably seen right GEO within GA via Opera Mini since November 2016.