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Cost of production decreased.

Demand for substitutes increased.

Demand is the amount of goods required or asked by the people in that economy.

Supply is the amount of goods given or available in an economy.

Improved technological means and ways of production implies and tends to lower down the cost of production. This means I can produce more by incurring the same cost as initial. The question also states that new firms have entered into the market. They will contribute to the supply hence the supply curve shall shift rightward. This means that at the prevailing prices, supply increases.

Since, the demand for substitute good has increased, the demand for cell phone shall reduce.

Hence, it can be concluded that the supply curve will be shifting to the right and demand will be shifting to the left.

Case 1: When both demand supply shift in same proportion

This leads to a fall in price, but same equilibrium quantity.

Case 2: When demand changes by greater proportion than supply

This results in fall in equilibrium price and quantity both.

Case 3: When supply changes by greater proportion than demand

This results in increased equilibrium quantity but reduced price.