Apple said it received a "record number" of first day pre- orders of iPhone 6 and iPhone 6 Plus, the biggest advancements in iPhone history with over four million in the first 24 hours.
"Demand for the new iPhones exceeds the initial pre-order supply and while a significant amount will be delivered to customers beginning on Friday and throughout September, many iPhone pre-orders are scheduled to be delivered in October," Apple said in a statement.
Additional supply of iPhone 6 and iPhone 6 Plus will be available to walk-in customers on September 19 at Apple retail stores, it added.
Last year, Apple sold nine million units of iPhone 5s and iPhone 5c models within three days after the launch of the new iPhones on September 20.
The iPhone 6 and iPhone 6 Plus will be available to customers in India from October 17, less than a month from its global launch.
The iPhone 6 is priced at USD 199 (16GB), USD 299 (64GB) and USD 399 (128GB) with a two-year contract. The iPhone 6 Plus will be available for USD 299 (16GB), USD 399 (64GB) and USD 499 (128GB) with a two-year contract in the US.
Both models will be available from September 19 from AT&T, Sprint, T-Mobile, Verizon Wireless, additional carriers and select Apple authorized resellers in the US.
"iPhone 6 and iPhone 6 Plus are better in every way, and we are thrilled customers love them as much as we do. Pre-orders for iPhone 6 and iPhone 6 Plus set a new record for Apple, and we can’t wait to get our best iPhones yet into the hands of customers starting this Friday," Apple CEO Tim Cook said.
The iPhone 6 and iPhone 6 Plus, which features a larger screen and longer battery life, will be available in the US, Australia, Canada, France, Germany, Hong Kong, Japan, Puerto Rico, Singapore and the UK from September 19.
Over 20 additional countries will have the new iPhone being sold from September 26, which includes Austria, Belgium, Denmark, Finland, Netherlands, Switzerland, Taiwan and Turkey, among others.