Apparently, a lot of people want the iPhone 6.

Apple sold a record 4 million iPhone 6 and iPhone 6 Plus smartphones on Friday, the first day that the new iGadgets were available for pre-order, the company said Monday.

Demand for the new iPhones was so high that the iPhone 6 Plus sold out within hours. While many people who pre-ordered the iPhone 6 will get them this Friday, many others won't get their iPhones delivered until next month.

"Demand for the new iPhones exceeds the initial pre-order supply," Apple said in a statement. The company noted that an additional supply of iPhone 6 and iPhone 6 Plus smartphones will be made available to walk-in customers on Friday Sept. 19, beginning at 8:00 a.m. local time at Apple stores.

People have already begun camping outside Apple Stores around the world to be among the first to get their hands on one of the new iPhones.

This is the first year that Apple announced how many iPhones it sold in the first day -- rather than in the first weekend. A year ago, Apple said it sold 9 million iPhone 5S and 5C smartphones in the first weekend.

But the numbers aren't exactly "apples to apples," pardon the pun. The iPhone 5S was not available for pre-order. Also, the iPhone 5S went on sale in China at the same time as as it hit store shelves in the United States.

This year, the iPhone 6 will not be available in China until at earliest October. China was not listed among the 30 countries that will get the iPhone this month.