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People generally talk less on the phone and send fewer text messages now because there are so many ways to communicate over an Internet connection. Though this may seem obvious to anyone who owns a smartphone, a new study confirms the trend.

Chetan Sharma, an independent mobile analyst, released a study this week on the state of the global mobile industry. It found that overall text-messaging use is growing, but more slowly, and in some parts of the world, texting is in steep decline.

For example, cellphone users in the Philippines, one of the top texting nations, sent roughly 400 text messages a month each on average in 2011, down from about 660 a month in 2010.

American cellphone users are still sending more texts than before — about 680 messages a month in 2011 compared to about 640 a month in 2010 — but this growth is much slower than in previous years. Mr. Sharma said text messaging here could start to shrink this year. He said he combined the results from carriers’ financial reports around the world with some private data to come up with the estimates in his study.

Backing Mr. Sharma’s findings, a previous report revealed a decline in text messaging in several parts of the world, including Finland, Hong Kong and Australia.

What’s causing the shrinkage? Messaging services that you can use over the data connection of a smartphone, as opposed to the carrier’s standard text messages. Apple’s iMessage, Google Voice and Skype provide this service.

As for phone calls (remember talking?), voice minutes are on the decline as well — but that’s old news. Voice minutes have been decreasing in the United States and Western Europe for the last four years, and in Japan for the last eight years, Mr. Sharma said.

But it’s not like carriers are suffering. Instead, they’ve successfully adapted to our growing hunger for mobile data. Carriers are raking in huge amounts of revenue from mobile data plans alone — the regular fees we pay to reach the Internet. One way they do that is by offering price structures that compel you to pay for far more data than you would actually use.

Worldwide revenue from mobile data in 2011 amounted to $300 billion, according to Mr. Sharma’s findings. Revenue for mobile operators overall will total $1.5 trillion this year, with mobile data accounting for 28 percent of that, the study estimates. Profits for carriers have more than doubled over the last 10 years, the study found.

“The global mobile industry is the most vibrant and fastest growing industry,” Mr. Sharma said.

Looking at mobile devices, the NPD Group, a research firm, released numbers on Wednesday showing that Apple is the No. 1 smartphone maker in the United States with 29 percent of the market, while Samsung has become a fierce rival. Samsung in the last quarter accounted for 24 percent of smartphones sold in the United States, according to NPD.

Ross Rubin, executive director of Connected Intelligence for NPD, said Samsung is performing so well because so many carriers sell and promote its phones. “Samsung is the only market leader from the featurephone era to transition to market leadership in the smartphone era in the U.S.,” he said in a statement. By contrast, Nokia is one cellphone maker that hasn’t successfully made that transition