The good news for those with a Samsung phone is that there is similar functionality to Apple Siri on the Samsung called Google now.
Make sure you have the latest version of the Google app. (To get the latest version, go to the Google app page on the Play Store and touch Update).
Open the Google app .
In the top left corner of the page, touch the Menu icon > Settings > Voice > "Ok Google" detection.
Check the box next to "From Google app."
To get Google to do something for you or get information, tap on the Microphone icon or say ”Ok Google”
The commands for Google are similar to those for Siri listed above under the iPhone tips. Try them out.