Working in tech support for a living - I really make it a point never to update things unless there is a problem mainly my computer but my phones also. For some unknown reason I seen a available update and I did it a vouple weeks ago. My phone started doing weird things. Number one I wasn't receiving a large amount of calls and no notification I ever had a missed call in my logs, number 2 my notification sounds weren't working, number two I couldn't reject incoming calls I didn't want to answer... just a lot of things that were really irrating. I first called BestBuy because we bought their warranty since it was cheaper than SPrint and they would replaced the phone for free unlike sprint who would have a large fee to replace the phone if something happened. After being transferred twice and waiting on hold for several minutes each time. The lady told me I needed to call Samsung otherwise I could start paperwork to swap my phone for a new one but would take some time without a phone. I didn't like this idea so I said I would call Samsung. Samsung asked if I called SPrint. Why would I my husband has the same phone purchased at the same time but didn't do the upgrade and no problems. So they idea was to transfer me over to someone who would help me bacukp everything on my phone do a factory reset and then reload. This process took forever and I ended up loosing all my contacts which was the most important thing for me to keep....... So my phone however now has the update and is working properly. The best guess was that when I did the update something got corrupted................ So I will not be attempting anymore updates