More evidence now suggests that the release date of the iPhone 5S and iPhone 5C will be on Sept 20. The consistent leaks of both the phones have filled the Apple fans with anticipation. Moblie carriers and retailers in the U.S seem to be preparing for the big launch.

The iPhone 5S along with the lower cost 5C are rumoured to make their first debut in an event by Apple on Sept 10. Both devices are expected to be available internationally ten days after this event.

The iPhone 5S is expected to be the new flagship phone from Apple. It is rumoured to come with some exciting upgrades and features. The phone is rumoured to come with a fingerprint scanner for security, A7 chip and a whopping 128GB memory variant.

The 5C expected to be the cheaper of the two is rumoured to be a mid-range phone. The phone is expected to come with a dual core processor, 1 GB RAM, an 8 MP primary and a 1.2 secondary camera.

The iPhone 5S is rumoured to carry a price tag between $600 and $700 for a non contract purchase. Users will be able to buy the phone at subsidised rates from different carriers. Many of the big retailers are also offering good trade in deals to owners of the older generation of iPhones.

The 5C is rumoured to come with a price tag between $200 and $300. The phone is also rumoured to replace the iPhone 5, making the 4S the entry level phone. But it is still unclear which phone Apple would wish to continue. It is also speculated that "siri" would not be available in the 5C.

According to a report from TmoNews, there are rumours that T- Mobile is planning a "blackout" for its employees between Sept 20 and 22. A blackout is period during which employees are not allowed to go on vacation leave et al. The rumour, if true, could be in anticipation for the rush during the period due to the launch of iPhone 5S. This gives credence to the Sept 20 release date rumours.

The move could also be seen as preparation for another launch. The Samsung Galaxy Note 3 is due to be released early next month. The sales of the device, however, are not expected to warrant a blackout by the carrier.

Meanwhile there have been constant leaks of both the phones, building up the suspense for the big release date. Click here to read about the champagne coloured variant of the iPhone 5S. The lower priced iPhone 5C is rumoured to come in a plastic body and five bright colours. Click here to see a leaked video of the body of the phone in lemon yellow colour.