LG Electronics hit the 10 million mark for LTE smartphone sales last week, less than two years after it unveiled its first LTE model.

Its first LTE phone, called the Revolution, was released in North America in May 2011, and since then, the company has seen tremendous growth. It hit the 5 million sales mark last August and doubled that figure in just six months.

"It took time to build up market response at the beginning, but after hitting the five million mark in about 15 months, we were able to sell another 5 million smartphones in just 6 months," a LG spokesman said. "With the Optimus LTE and very popular View series, we're seeing increased sales of LTE smartphones."

The company has sold LTE smartphones in more than 10 countries, including Germany, Japan, Korea and the U.S. It plans to roll out its new high-spec Optimus G series in about 50 countries in the first quarter of this year. The less-expensive model will also be released for budget-conscious consumers.