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If you want to block calls from a certain time on your samsung galaxy s5 its a nice feature you can setup. It will mainly be useful for late time night hours where you prefer to not be bothered. So to set this up go into the settings and scroll down to personalization then click blocking mode. Once in there make sure blocking mode is turned on to the right then uncheck always. From here you can set the from and to time. You can also allow certain contacts that would be okay for calls in whatever block time you choose.