$1.$ What is the primary pricing objective T$-$Mobile is using?$$

T$-$Mobile's primary pricing objective is market penetration. They offer lower prices and unlimited data plans. They use these strategies to attract price$-$sensitive customers and gain market share.

$2.$ Is the cellular phone market price elastic $($i$.$e$.,$ less than $1)?$

The cellular phone market is generally considered to be price elastic. There are many substitute products and services available, and customers are likely to switch to a competitor if the price of their current provider increases. However, the price elasticity of demand can change depending on the specific market segment and the availability of substitutes.

$3.$ Of the factors influencing price elasticity of demand, which is the most salient for the cellular phone market? What are T$-$Mobile and its competitors doing to mitigate this factor?$$

The most salient factor influencing price elasticity of demand in the cellular phone market is the availability of substitutes, such as other cellular providers, landlines, or internet$-$based communication services. To fix this factor, T$-$Mobile and its competitors are investing in developing and marketing unique features and services that make their products different from substitutes. They will add faster data speeds, unlimited data plans, and exclusive content.

$4.$ Which of the four levels of competition best describes the cellular phone market?

The cellular phone market can be described as an oligopoly, with a few large players dominating the industry and competing on price, service quality, and network coverage. T$-$Mobile, Verizon, AT&T$,$ and Sprint, are the major players in the US cellular phone market, and they often engage in pricing wars and promotional deals to gain market share. However, there are also smaller competitors and new entrants that challenge the dominance of these larger companies, making the market somewhat competitive.