Dear Members here the Samsung is advertising Spotify is free for Galaxy users but no where I found how get activated after downloading the Spotify

The samsung F22 is not being provided with official App Lock. Any member can suggest the best one of app lock

Recently I have purchased samsung F22. This phone is getting restarting again and again after every 3 to 4 hours. Further downloading apps from play store also have some problem. No response from CCSD of samsung any one Pease suggest resolution