British carrier Vodafone already listed a "4G iPhone 6" among its mobile phone offerings, which indicated that the iPhone 6 release date may be sooner than later.

The most recent listing of the cellular company could be a preparation for the onslaught of pre-orders for the next iPhone.

It seemed that Apple was not bothering to wait for a full year to release the next generation of its flagship smartphone. This current iPhone 6 sighting excited many iPhone fans. Did this mean that Apple was dropping the rumoured low-cost iPhone 5S?

Vodafone's listing could also possibly be a simple typographical error made by the cellular company.

According to rumours, Apple's iPhone 6 will feature a A7 quad core processor which claimed to be faster than the previous processor, which will be paired with iOS 7 operating system that was packed with new and better features.

Apple may increase the storage capacity of its smartphones with the possibility of iPhone 6 coming with 16GB, 32GB, 64GB and 128GB internal storage. The company may also add a new security feature to its devices with the inclusion of fingerprint sensor in the home button.

IBTimes AU previously reported that the iPhone 6 release may happen in November or December, as suggested by latest internal memo from Apple execs.

Apple-centric website 9to5Mac revealed an internal memo from Apple in which the management asked employees around the world for ideas for selling and supporting the iPhone.

"Do you have a great idea about iPhone?," the memo begun. "Do you have a thought about something that is missing in the store environment that would help bring iPhone to life?" Apple employees were all invited to submit their ideas for the new iPhone. The team of selected candidates will fly to California for an eight-week trip from August to October 2013 to brainstorm the next iPhone event.

Thus, the iPhone 6 release date may be scheduled sometime in November or December, right before the holiday season.

However, the Cupertino-based company remained tight-lipped on the rumours surrounding its devices.