All you need to know when an umpire calls out a no ball

A no ball is an extra run conceded by the bowing side. An umpire signals a no ball by raising one of his hands on the side at shoulder height. One of the 42 laws of cricket is entirely dedicated to no ball. Based on the official regulations, here is when a no ball can be signaled by the umpires.

The bowlers cannot bowl underarm unless there is an agreement before the match between both teams. If any bowler does bowl underarm, that delivery would be considered a no ball. In some cases, an umpire might give a warning to the bowler. However, if a second underarm is bowled, the umpire would signal a no ball and may also suspend the bowler.
If before bowling the delivery, a bowler fails to inform the umpire from which side (over or around the wicket) they are going to bowl, then the umpire can signal a no ball.
If the batter and the umpire feel that the bowler’s bowling action is not as per the laws of the game, then the umpire can give a no ball. This usually occurs when the bowler “throws” the ball instead of bowling it with a straight arm.
If the bowler’s delivery stride (the jump he takes before releasing the ball) is behind the designated area on the pitch, a no ball can be signaled.
One of the two most common modes of no ball is when the bowler’s front foot goes over the crease while releasing the ball. In modern days, this results in an extra run and a free hit is given to the batting side wherein no batters can be deemed out on the next ball.
The second common mode of no-ball is when the ball is directed above the bowler’s head after pitching, or if the ball is directed over the batter’s waistline without pitching. In the former case, a bowler might get a warning (first bounce), but a second bounce will result in a no ball.
If the bowler’s side of the stumps are dislodged by any object or part of the bowler’s body before the ball is released, then it is a no ball.
When the ball pitches outside the pitch, then a no ball is given.
If the ball rolls on the pitch or bounces more than once, then it is a no ball.
If the ball comes to rest in front of the striker, the umpire should call it a no ball.
Should the ball touch any fielder except the wicket-keeper before it reaches the batter, then it is called a no ball.
Some other scenarios where a no-ball is called are improper positioning of the wicket-keeper, encroachment of the pitch by fielders, more than two fielders standing behind the leg side, or bowler bowling deliberate no balls and unfair deliveries.
If a No-ball is also a wide ball, the ball would be called out as a no ball.