The iPhone 6 and iPhone 5S release date is coming very soon and consumers are starting to sell their old iPhones.

It was confirmed that the iPhone 6 and iPhone 5S release date will take place on September 10 after Apple sent out invitations to the press event last week. However, it is still unconfirmed whether Apple will release two iPhones.

According to widespread rumours, the iPhone 6 features may include a larger screen display, A7 quad core chip paired with 3 GB RAM, Near Field Communication, 13 MP back camera, up to 128 GB internal storage and longer battery life.

Meanwhile, the cheaper iPhone dubbed as iPhone 5S or iPhone 5C may include some specs and features such as 4-inch screen display, a dual core processor, 8 MP back camera as well as a cheaper plastic casing. It was also reported that the handset will be available in different colours.

However, Apple offered no confirmation on the aforementioned iPhone 6 and iPhone 5S specs and features so we'll all just have to wait for the official announcement come September 10.

Yes, the iPhone 6 and iPhone 5S release date is very soon. If you have plans of buying the new iPhone models, you might want to consider selling your old iPhone before you do.

Below are the five places where you can sell your old iPhones to be used in buying the next iPhone.

Apple Store - According to reports, users who will trade in their old iPhones can get as much as $280 worth of credit, which can be used in buying the next iPhone. However, the Apple credit that you will get from your old iPhone is dependent on the condition of your handset and must only be used in buying the new iPhone.

eBay and Amazon - Apple users can also sell their old iPhones on Web sites like eBay or Amazon. Sometimes, users can get a better deal on these websites compared to the credit that they will get from trade-in programs.

Gazelle - One of the popular online tech trade-in company is Gazelle. The Web site offers a guaranteed trade-in price until October 15. This is good news for Apple users who plan to sell their old iPhone 5 as prices will go down after the next iPhone is announced. However, Gazelle does not accept the first generation of iPhone for their trade-in program. Unlocked iPhones can get a higher trade-in price compared to iPhones locked in with a carrier.

NextWorth - Another Web site similar to Gazelle is NextWorth. This Web site accepts your old iPhones no matter what the condition of your handset is and will pay accordingly. The company offers a higher price compared to other trade-in programs. Currently, NextWorth offers between $97. 87 and $340 for a 16 GB iPhone 5.

Retailers and Resellers - Physical retailers and resellers like Best Buy and Wal-Mart in the U.S. also offer trade-in programs to Apple users. These retailers also offer Apple devices at a lower price due to the imminent iPhone 6 and 5S release date.