Apple has accepted record number of pre-orders for its latest smartphones - iPhone 6 and iPhone 6 Plus - and the record booking has caused delays in delivery.

Some reports claimed that the delays in delivery have allowed some vendors to charge extortionate sell-on prices from interested customers.

It is learned that the customers would have to wait three to four weeks to get their hands on iPhone 6 Plus as the huge demand has strained available supply.

The new iPhone 6 is set to go on sale on Sept. 19 in the US, but the company began taking online orders on Thursday.

The larger 5.5-inch iPhone 6 Plus model is now displaying a wait time of up to a month, the 4.7-inch version remains available for delivery on September 19, Apple's Web site showed. Verizon Wireless Inc, AT&T; Inc and Sprint Corp are also displaying shipment delays of up to six weeks on their respective Web sites.

According to Apple, the pre-booking for the new iPhones has been far better than any of its previous iPhones.

"Response to the iPhone 6 and iPhone 6 Plus has been incredible, with a record number of pre-orders overnight. Pre-orders are currently available online or through the Apple Store App," spokeswoman Trudy Muller said.

The latest iPhones come with larger screens and it was earlier mentioned by some analysts that the production issues may hamper the initial runs. The suppliers of these phones scrambled to get enough screens ready because the need to redesign a key component had disrupted panel production.