Let me start by saying that Sony produced a very solid product but with some glaring issues. Sorry to say that I had to return the z1s. Such a beautiful device with the best software on the market but I don't know why Sony failed to address 2 major issues it has with their other z line...AUDIO QUALITY!!! With many users using their devices as their main device for audio I can't understand why Sony decided to muzzle the loudness of the 3.5 mm headphone. The music it produced was crisp but utterly failed when it came to loudness. Even low end smartphones best the z1s in that area. Also, it is impossible to use the phone with the speaker because its impossible for the other party to hear you. The sound is very muzzled as if you are talking through a pillow when using the speaker. It was also impossible to use google plus and voice text because the applications can't recognize what you are saying. After I googled the problem and saw that the zl,z and z1 had the same issues I couldn't make myself keep a product that hasn't been fixed in earlier iterations. I was highly disappointed..oh well ..got the LG g2