Android Touch Issue

Hello everybody! I`ve stuck with my game.

When i was developing my game i was testing it via my PC, but once i decided to try it on my Mobile Phone (it`s on Android 5.1) and i had a huge problem: my jump system was working incorrect. I want to describe you my system: i gave to my character ability to jump few times (i`ve set statement of this ability to 0.5, that gave him possibility to jump at least 4 times), but when i`ve started game on my phone i noticed that character is able to jump only 1 time and less often for 2 times. It`s very necessary for me, help please!

  myRigidBody.velocity = new Vector2 (moveSpeed, myRigidBody.velocity.y);

     if (Input.GetTouch (0).phase == TouchPhase.Began)
     {
         if (grounded) {
             myRigidBody.velocity = new Vector2 (myRigidBody.velocity.x, jumpForce);
         }
     
         for (var i = 0; i < Input.touchCount; ++i) {
             if (Input.GetTouch (0).phase == TouchPhase.Began) {
                 if (jumpTimeCounter > 0) {
                     myRigidBody.velocity = new Vector2 (myRigidBody.velocity.x, jumpForce);
                     jumpTimeCounter -= Time.deltaTime;

                 }
             }

             if (Input.GetTouch (0).phase == TouchPhase.Began) {
                 jumpTimeCounter = 0;
             }

             if (grounded) {
                 jumpTimeCounter = jumpTime;
             }

         }
     }

Thanks a lot!