Well, I believe that antitrust laws are inherantly evil and immoral. The laws are written in a way that is so vague that they are impossible to follow. A business doesn't know if they have disobeyed the all-powerful regulators demands until they come knocking on their door. This is the essence of a dictatorship, not a constitutional republic like the US is supposed to be. Dictators keep their people on their toes, constantly changing their demands, so as to keep them under constant terror and threat of punishment. This is no different than the antritrust laws. Look at the Microsoft antitrust case. They were scrutinized for GIVING their product away when they bundled IE with Windows. Other cases punish companies for "price gouging" or "price fixes". The only given common denominator given by regulators is "anti-competitiveness". This is an undefinable term. I would argue that in the AT&T case, their desire to acquire T-Mobile is the essense of competition. They want to increase their competative position against companies like Verizon and Sprint.
But, regardless, the real question that needs to be answered is do we have a RIGHT to certain prices, certain products, or certain numbers of companies existing? I say NO. Rights are only a right to action, not a right to products or to the work of others. Imagine if, instead of T-Mobile being bought by AT&T, they just decided to close their doors. Should the government force them to stay open because "consumers have a RIGHT to more than 3 mobile carriers"? It's insanity. No one forces you to buy a cell phone or deal with any particular cell phone company. You do so voluntarily. If you don't like a company's products or prices you have the RIGHT not to deal with them. Similarly, they have a RIGHT to charge very high prices and lose customers accordingly. The point is, this all comes down to the definition of rights, and the government's proper role with respect to them. I believe that the government's only job is to protect each individual's life. There is no proof in reality that cell phones or a certain price for a cell phone is anyone's right.