There's bad news to those who have not preordered iPhone 4S: pre-orders for iPhone 4S have been sold out.

The iPhone 4S is so popular that it was sold out in a single day at the online Apple store.  The company started accepting online pre-orders on Oct. 7. Like the previous iPhone 4, the iPhone 4S also has black and white two color versions, each with 16 GB storage capacity for $199, 32 GB for $299?and 64 GB for $399.

In 2010, Apple received 600,000 pre-orders for iPhone 4. iPhone 4S seems to have broken that record with Apple receiving pre-orders for 1 million units.

So far three major carriers, AT&T, Verizon and Sprint, offer service for iPhone 4S. AT&T received more than 200,000 pre-orders in the first 12 hours on Friday, claiming the launch is the most successful iPhone launch ever.  With this in mind, it will be easy to understand that both Apple's and AT&T's online stores went down for a short time, when the phone went on sale for pre-order.

The online Apple Store has updated its shipping estimates as In one or two weeks. Although on its website it says that iPhone 4S will be available at the Apple Retail Store beginning at 8:00 a.m. on October 14 on a first-come, first-served basis, it appears that users, who have preordered the device, might not be able to pick one up on launch day.

Verizon and Sprint have not released presales figures yet. Although Apple have not revealed the number of iPhone 4S available for the pre-order, it will surely be another big success of Apple, which can be seen from the fact that some Apple fans have already started camping outside the Apple stores.

According to Mashable's Charlie White, three people currently are queuing for an iPhone 4S at Apple's 5th Avenue store in New York City, and among them, two have been waiting for a total of 12 days.

The iPhone 4S features the new personal voice assistant Siri, A5 dual-core processor, an 8 MP  camera, and iOS 5. These new functions are supposed to help iPhone 4S break old sales records for all Apple's devices.

The company holds a record of selling 1.7 million iPhones in three days in June of 2010. But Apple would sell 25 million handsets in the current quarter, according to an analyst Gene Munster at Piper Jaffray.