TMUS is a buy; current price near 52-week low ($149) is below fair value ($223).

Elon Musk and SpaceX delivered bad news to investors in AT&T, Verizon, T-Mobile, and AST Space Mobile.

Shares of AT&T, T-Mobile, and Verizon were hit hard, and are down more than 10% each today.

However, I believe this represents a buying opportunity for T-Mobile, which is trading today near its 52- week low of $149. I have calculated the fair value and updated it today to $223.

So, I really think this is a buying opportunity for T-Mobile.

The other three companies were undervalued with a sufficient margin of safety to justify taking advantage of this buying opportunity at this low point.