I recently bought a ATIV S Telus T899M. I use it on T-mobile. The first thing I did was download GDR3. It runs great. No issues with calls, internet, sms, mms. The only bad thing is I don't get LTE. Only 4G, 3G and H+. There's no LTE option under cellular settings. I read that you can make some changes with the Samsung diagnosis app to get LTE. Unfortunately when I try to download the app it says not available for your phone. I've changed my region to multiple different ones with no luck. So if anyone knows how I can get the app please let me know.
Thanks
Thanks