what are some real-world examples that happen in the cellphone industry that causes a threat to new entrants? I need an example of how a phone brand company eliminates competition because of they have more resources and how they retaliate against a new firm entering. (please do real-world examples like Samsung or any other phone brand company please use 2 or more and how they relate to each other)

THIS IS THE MOST IMPORTANT ONE:

an example of how a new firm entering is affected by being a threat to the industry, and what are their barriers to entry as a new cellphone brand. please be clear and USE A REAL WORLD PHONE BRAND COMPANY LIKE SAMSUNG OR APPLE OR OTHER LOWER KNOWN BRANDS