The iPhone 5S and the iPhone 5C will be available without contract and SIM free through T-Mobile.

T-Mobile is offering the iPhone 5S unlocked and without contract says Apple's website. Along with AT&T, Verizon and Sprint, T-Mobile will be offering the handset by September 20. The iPhone 5S will not be available for pre-order.

The unlocked iPhone 5S model is A1533 (GSM). It is priced at $649 for the 16GB model, $749 for the 32GB model and $849 for the 64GB model through T-Mobile.

Buyers of unlocked and contract-free units of the iPhone 5S will be receiving a nano SIM card already installed on the phone. Users are then requested to visit any Apple store or T-Mobile store to activate the SIM. SIM activation can also be done through phone by calling T-Mobile.

The iPhone 5C unlocked model is A1532 (GSM). The iPhone 5C, like the 5S, will also be available unlocked and without contract through T-Mobile. The cheaper and colorful version of the iPhone is priced at $549 for the 16GB model and $649 for the 32GB model.

iPhone 5C will be available either unlocked, contract free with a T-Mobile SIM or unlocked, contract free without a SIM. Users who are intending to purchase the unlocked, contract free iPhone 5C with a T-Mobile SIM will receive a nano SIM card already installed on the handset. Like the iPhone 5S, activation can be done through visiting any Apple or T-Mobile Store and through phone by contacting T-Mobile.

For users looking to purchase the unlocked, contract free and SIM free version of the iPhone 5C, the device requires a GSM compatible SIM. According to Apple, users in the U.S. can purchase such SIMs from AT&T and T-Mobile. International users can purchase nano SIM cards from local GSM carriers.

Unlike the iPhone 5S, the iPhone 5C will be available for pre-order by September 13. Both handsets will come with the iOS 7, Apple EarPods with remote and mic, lightning to USB cable and a 5W USB power adapter.