What code have you tried previously?

This is a pretty standard way of hiding the address bar in mobile.

// New event listener:
window.addEventListener("load",function() {
    setTimeout(function(){
        // Hide the address bar:
        window.scrollTo(0, 1);
    }, 0);
});

JSFiddle to demonstrate: https://jsfiddle.net/bjcra2vx/

Extended solution from above. This should cover all bases for you. Next time please share your own attempts first:

// Extended solution for hiding address bar:

(function() {
    
  var browser = window,
      doc = browser.document;

  // If there's a hash, or addEventListener is undefined, stop here
  if ( !location.hash || !browser.addEventListener ) {

    //set to 1
    window.scrollTo( 0, 1 );
    var scrollTop = 1,

    //reset to 0 if needed
    checkWindowBody = setInterval(function(){
      if( doc.body ){
        clearInterval( checkWindowBody );
        scrollTop = "scrollTop" in doc.body ? doc.body.scrollTop : 1;
        browser.scrollTo( 0, scrollTop === 1 ? 0 : 1 );
      } 
    }, 15 );

    if (browser.addEventListener) {
      browser.addEventListener("load", function(){
        setTimeout(function(){
          //reset to hide address
          browser.scrollTo( 0, scrollTop === 1 ? 0 : 1 );
        }, 0);
      }, false );
    }
  }

})();