+1. Do not upgrade to W10M !!! W10M is so laggy, so unstable ! Since I revert to WP8.1, my Lumia is fluid, stable... I reinstalled all needed oldies but goodies apps (Whatsapp, Viber, Skype, Feedlabs, AppRadio, TripAdvisor, Moovit, SpeedTrap, Bing Translation, Waze, Soundhound, Subway surfer...