The Samsung Galaxy S4 is my 5th contract mobile phone and the most expensive. Never had a worse device !! After 4 weeks of use, I was by now on tel afterwards. Unreachable. Constantly, the phone hangs up, it is so annoying that I practically no longer take with it, although I have a FLAT-contract, the monthly cost 79,90 Euro (!). But the HAMMER ... The lady in the shop of the network operator (got there the Samsung reclaims), told me that it is clearly is a software error. You can send it there, but I need a repair time between 4 and 6 weeks (!) Expect ... AT LEAST !!! Bin soooo pissed bought and am now on a transitional basis for a Sony 1/3 of the amount ... Maybe I'll stick with it?