The unlocked iPhone 5s is offered in 16GB, 32GB and 64GB models and the prices go up by $100 for every variant so the most expensive 64 gig model costs $849.
If you choose to buy the unlocked model, you’d need to put in your own nano SIM card. In the United States, AT&T and T-Mobile are GSM carriers and you can use it on both.
The color options for this new unlocked iPhone 5s model are the same as all others - space grey, gold and silver. You can buy it right now at the source link below and shipping times currently stand at 2 to 3 weeks. Expect to see the unlocked iPhoen 5s in Apple brick and mortar stores in the following weeks.
source: Apple Store via 9to5Mac