It is now October 2017. Is 6.0 available? I have an S5 G900A that was bought in June this year. It was a return that was on the first OS. I don't know all the OS' that was for this phone. I went through all the updates, and it has 6.0.1. I really like this phone, BUT there are over 1400 mp3s. The problem is the phone won't let me add more music. I do have a concern when T-Mo may not recognise the S5 in the future. My S5 is only used for calls. Don't suggest anything Apple.