Sifting through countless of stocks in the Wireless Telecommunication Services industry can be tedious, and sometimes two stocks are just too similar to judge which is the better investment. If you’re on the fence about investing in Millicom International Cellular S.A., SK Telecom Co. or Ltd. because you’re not sure how they measure up, it’s important to compare them on a few factors before making your decision.

Read on to learn how Millicom International Cellular S.A., SK Telecom Co. and Ltd. compare based on key financial metrics to determine which better meets your investment needs.

About Millicom International Cellular S.A., SK Telecom Co. and Ltd.

Millicom International Cellular S.A. engages in the provision cable and mobile services in Latin America. The company offers mobile services, including mobile data and voice, and short message services; and mobile financial services, such as payments, money transfers, international remittances, savings, real-time loans, and micro-insurance. In addition, the company provides fixed services, including broadband, fixed voice, and pay-TV; and fixed-voice and data telecommunications services, managed services, cloud and security solutions, and value-added services; and tower infrastructure and services. The company serves small, medium, and large businesses, as well as residential consumers and governmental entities. It markets its products and services under the Tigo and Tigo Business brands. The company was founded in 1990 and is headquartered in Luxembourg, Luxembourg.

SK Telecom Co., Ltd. engages in the provision of wireless telecommunication services in South Korea. The company operates through three segments: Cellular Services, Fixed-Line Telecommunications Services, and Other Businesses. The Cellular Services segment offers wireless voice and data transmission, cellular interconnection, Internet of Things solutions and enterprise communications, cloud, subscription, advertising and curated shopping services; as well as sells wireless devices. Its Fixed-Line Telecommunications Services segment provides fixed-line telephone, broadband Internet services; media platform services, such as internet protocol TV and cable TV; and business communications and related infrastructure services. The Other Businesses segment offers T-commerce services. In addition, it provides call center management, base station maintenance, information gathering and consulting, database and internet website, and broadcasting programs; international telecommunication and mobile virtual network operator services; and operates information and communications facilities; as well as engages in telecommunications and communication device retail; and software development and supply business. SK Telecom Co., Ltd. was incorporated in 1984 and is based in Seoul, South Korea.

Latest Wireless Telecommunication Services and Millicom International Cellular S.A., SK Telecom Co., Ltd. Stock News

As of July 31, 2026, Millicom International Cellular S.A. had a $16.0 billion market capitalization, compared to the Wireless Telecommunication Services median of $9.1 million. Millicom International Cellular S.A.’s stock is up 72.2% in 2026, up 1% in the previous five trading days and up 142.02% in the past year.

Currently, Millicom International Cellular S.A.’s price-earnings ratio is 13.0. Millicom International Cellular S.A.’s trailing 12-month revenue is $6.4 billion with a 19.1% net profit margin. Year-over-year quarterly sales growth most recently was 45.1%. Analysts expect adjusted earnings to reach $4.720 per share for the current fiscal year. Millicom International Cellular S.A. currently has a 3.1% dividend yield.

As of July 31, 2026, SK Telecom Co., Ltd. had a $12.1 billion market cap, putting it in the 80th percentile of all stocks. SK Telecom Co., Ltd.’s stock is up 54.1% in 2026, down 11.3% in the previous five trading days and up 42.67% in the past year.

Currently, SK Telecom Co., Ltd.’s price-earnings ratio is 29.6. SK Telecom Co., Ltd.’s trailing 12-month revenue is $11.2 billion with a 2.2% net profit margin. Year-over-year quarterly sales growth most recently was -4.6%. There are no analysts providing consensus earnings estimates for the current fiscal year. SK Telecom Co., Ltd. currently has a 3.8% dividend yield.

How We Compare Millicom International Cellular S.A., SK Telecom Co. and Ltd. Stock Grades

Stock evaluation requires access to huge amounts of data and the knowledge and time to sift through it all, make sense of financial ratios, read income statements and analyze recent stock movements. AAII created A+ Investor, a robust data suite that condenses data research in an actionable and customizable way suitable for investors of all knowledge levels, to help investors streamline and work through such data.

AAII’s proprietary stock grades come with A+ Investor. These offer intuitive A‐F grades for each of five key investing factors: value, growth, momentum, earnings estimate revisions and quality. Here, we’ll take a closer look at Millicom International Cellular S.A., SK Telecom Co. and Ltd.’s stock grades to see how they measure up against one another.

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Millicom International Cellular S.A., SK Telecom Co. and Ltd.’s Quality Grades

Company	Ticker	Quality
Millicom International Cellular S.A.	TIGO	C
SK Telecom Co., Ltd.	SKM	A

Like the Value Grade, AAII’s A+ Investor Quality Grade comes from the percentile rank of key metrics. Specifically, the Quality Score is the percentile rank of the average of the percentile ranks of return on assets (ROA), return on invested capital (ROIC), gross profit relative to assets, buyback yield, change in total liabilities to assets, accruals, Z double prime bankruptcy risk (Z) score and the F-Score.

The score is variable, meaning it can consider all eight measures or, should any of the eight measures not be valid, the remaining measures that are valid. To be assigned a Quality Score, stocks must have a valid (non-null) measure and corresponding ranking for at least four of the eight quality measures.

The Quality Score is used to assess the underlying “quality” of a particular stock. A higher-quality stock possesses traits associated with upside potential and reduced downside risk. Backtesting of the Quality Grade shows that stocks with higher grades, on average, outperformed stocks with lower grades over the period of 1998 through 2019.

Stocks receive better grades (higher scores) for having higher scores for the quality subcomponents and worse grades (lower scores) for lower scores for the subcomponents.

Millicom International Cellular S.A. has a Quality Score of 54, which is Average. SK Telecom Co., Ltd. has a Quality Score of 86, which is Very Strong.

The Quality Grade Winner: SK Telecom Co., Ltd.

As you can clearly see from the Quality Grade breakdown above, SK Telecom Co., Ltd. has a better overall quality grade than Millicom International Cellular S.A.. For investors who are looking for companies with higher quality than others in the same industry, SK Telecom Co., Ltd. could be a good stock to add to their portfolios. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Millicom International Cellular S.A., SK Telecom Co. and Ltd.’s Momentum Grades

Company	Ticker	Momentum
Millicom International Cellular S.A.	TIGO	A
SK Telecom Co., Ltd.	SKM	B

Momentum grades help to uncover stocks experiencing anomalously high rates of return; research finds that stocks with high relative levels of momentum tend to outperform, whereas those with low levels of momentum tend to continue underperforming. Momentum is based on the price change of a stock over a specified period relative to all other stocks.

Typically, AAII looks at the weighted relative strength over the trailing four quarters. The weighted four-quarter relative strength rank is the relative price change for each of the past four quarters. The most recent quarterly price change is given a weight of 40% and each of the three previous quarters are given a weighting of 20%.

Millicom International Cellular S.A. has a Momentum Score of 91, which is Very Strong. SK Telecom Co., Ltd. has a Momentum Score of 61, which is Strong.

The Momentum Grade Winner: Millicom International Cellular S.A.

As you can clearly see from the Momentum Grade breakdown above, Millicom International Cellular S.A. is considered to have stronger momentum compared to SK Telecom Co., Ltd.. For those specifically looking for companies that have stronger momentum compared to other companies in the same industry, Millicom International Cellular S.A. could be a good stock to invest in. However, it’s important for investors to analyze multiple factors based on a wide range of metrics before deciding whether to buy.

Millicom International Cellular S.A., SK Telecom Co. and Ltd.’s Estimate Revisions Grades

Company	Ticker	Earnings Estimate
Millicom International Cellular S.A.	TIGO	B
SK Telecom Co., Ltd.	SKM	na

Earnings estimate revisions scores consider the magnitude of a company’s earnings surprise in its last two reported fiscal quarters. Often, positive surprises beget further positive surprises‐or at least continued sales growth (the exact opposite is generally true, too).

Estimate revisions offer an indication of what analysts are thinking about the short-term prospects of a firm. Estimate revisions are based on the statistical significance of a firm’s last two quarterly earnings surprises and the percentage change in its consensus estimate for the current fiscal year over the past month and past three months.

Millicom International Cellular S.A. has a Earnings Estimate Score of 65, which is Positive. SK Telecom Co., Ltd. does not have a meaningful Earnings Estimate Score.

The Earnings Estimate Revisions Stock Winner: Undetermined

If you are strictly an investor who focuses on earnings estimate revisions, you may want to add Millicom International Cellular S.A. to your watch list. However, because only one of the companies in our comparison has a valid Earnings Estimate Revisions Grade, we cannot call it a clear winner. Evaluation of the other grades for both companies is necessary in order to understand which stock is the better investment based on AAII’s proprietary scores and analysis.

Other Millicom International Cellular S.A., SK Telecom Co. and Ltd. Grades

In addition to Quality, Estimate Revisions and Momentum, A+ Investor also provides grades for Value and Growth.

Growth investing builds on the idea that stocks of companies exhibiting strong, consistent and prolonged growth outperform those of slower-growth companies. AAII measures growth through consistency of annual sales growth, five-year sales growth rankings adjusted for extreme levels, and consistency of positive annual cash from operations.

Successful stock investing involves buying low and selling high, so stock valuation is an important consideration for stock selection. Buying stocks that are going to go up typically means buying stocks that are undervalued in the first place, although momentum investors may argue that point.

These 2 key factors, when combined with the above, provide a holistic view into a particular stock. Further, by joining A+ Investor you can see whether Millicom International Cellular S.A., SK Telecom Co. and Ltd. pass any of our 60+ stock screens that have outperformed the market since their creation.

So, Which Is the Better Investment, Millicom International Cellular S.A., SK Telecom Co. or Ltd. Stock?

Overall, Millicom International Cellular S.A. stock has a Momentum Score of 91, Estimate Revisions Score of 65 and Quality Score of 54.

SK Telecom Co., Ltd. stock has a Momentum Score of 61, Estimate Revisions Score of and Quality Score of 86.

Comparing Millicom International Cellular S.A., SK Telecom Co. and Ltd.’s grades, scores and metrics can act as a solid basis to determine whether they may be a good investment or not. You’ll also want to look at your portfolio’s asset allocation as well as your risk tolerance and financial goals to see if either of these stocks would make a good fit for you. AAII can help you figure out which investments align with your individual needs and preferences.

Investors are encouraged to do their own due diligence and research. In this way, individuals can effectively become managers of their own assets‐without having to rely on others for financial independence. You can count on AAII for timeless articles on financial planning and stock-picking, unbiased research and actionable analysis.

A+ Investor adds to our qualitative teaching with a powerful data suite to help you whittle down investment choices to find stocks, exchange-traded funds (ETFs) or mutual funds that meet your needs.

AAII Disclaimer

We make no representations or warranties that any investor will, or is likely to, achieve profits similar to those shown, because past, hypothetical or simulated performance is not necessarily indicative of future results. Before making an investment decision, you should consider your circumstances and whether the information on our content is applicable to your situation. This information was prepared in good faith, and we accept no liability for any errors or omissions. The full disclaimer can be read here.