A decade ago, T-Mobile US (TMUS -0.06%) had just closed its $1.5 billion all-cash buyout of the Metro PCS prepaid service provider. Its first attempt to merge with Sprint was just around the corner, and the game-changing series of "Uncarrier" policies was in full swing.

Big Magenta has come a long way from that crossroads. What if you saw long-term promise in the unconventional telecom carrier back then, invested a cool $1,000, and held on tight until February 2024?

Let's have a look.

Charting the 10-year return

A picture speaks a whole bunch of words, so let's start there. Here's how that hypothetical $1,000 investment in T-Mobile would have played out over the last decade, compared to a similar bet on the S&P 500 market index:

TMUS Chart

TMUS data by YCharts

Your $1,000 T-Mobile stake would be worth roughly $5,400 today, compared to $2,820 if you simply tracked the broader market instead.

As it turns out, that T-Mobile bet also outpaced investments in its chief competitors by a mile-wide margin. An investment of $1,000 in Verizon Communications stock in 2014 would be worth just $883 today, and an AT&T bet of the same size would have dwindled to $724.

Dividends -- the great equalizer?

But wait. Ma Bell and Big Red always offer generous dividend yields. So do exchange-traded funds (ETFs) matching the S&P 500, such as the Vanguard S&P 500 ETF. But T-Mobile only started sending out dividend checks two quarters ago and its forward-looking annual yield is just 1.6%.

Did those robust payouts change the game for AT&T and Verizon investors? Let's see what a four-way chart looks like with dividend reinvestments enabled for everybody:

TMUS Chart

TMUS data by YCharts

The two larger telecoms managed to grow your money with reinvested dividends along the way, but the short answer is still a clear "no." Their dividend-boosted annual returns still only averaged approximately 4%.

The S&P 500 fund came closer this time with a final tally of $3,400, but T-Mobile's unchanged return is still the king of the telecom hill at $5,400. That's a compound average growth rate of 18.4% per year.

Big Magenta is my favorite telecom idea today, too

Ten years ago, investing in T-Mobile was akin to choosing the underdog in a telecom tug-of-war. Fast-forward to today, and it's clear that Big Magenta wasn't just barking up the right tree -- it was replanting the whole forest. The former telecom duopoly is now a pretty balanced competitive scene with robust pillars of red, blue, and magenta.

While Verizon and AT&T were busy counting pennies for their dividend checks, T-Mobile merged with Sprint in a $26 billion stock-swap deal to rebalance the wireless phone industry. It never stopped pushing the envelope with innovative sales tactics and consumer-friendly prices. Sometimes, the best dividends are those of daring and innovation.

In the long run, betting on the company that's disrupting an overly conservative industry can send you laughing all the way to the bank. In T-Mobile's case, it's money in your pocket. The next 10 years may not be as game-changingly successful, but T-Mobile is still the only American telecom stock I would recommend today.