If I buy a factory unlocked iphone will it work with all sim cards?

The SIM-free iPhone comes without a wireless contract commitment or carrier financing. It doesn’t come with a nano-SIM card for iPhone 5s. And because it’s unlocked, it isn’t tied to one carrier, so you can get a nano-SIM from any supported GSM carrier worldwide, such as AT&T and T-Mobile in the United States.

Purchasing a SIM-free iPhone means you will not qualify for the lower iPhone price associated with a contract or a carrier installment plan.

If you don’t want a multiyear service contract, or if you prefer to use a local carrier when traveling abroad, the SIM-free iPhone is the best choice.

For details on LTE network support, please see www.apple.com/iphone/LTE.

Credit check may be required; must be 18 or older. A SIM-free, unlocked iPhone 5s may be activated on supported GSM carrier networks. See www.apple.com/iphone for more information. Service may not be available in all areas or at the signal strength, rates, speeds, or bandwidth as demonstrated. Wi-Fi Internet access required for some features; broadband recommended; fees may apply. Some applications, features, and services are not available in all areas. Check with your service provider about network coverage in your area and international roaming options. Warranty information available at www.apple.com/legal/warranty/iphone. When available, transferring your mobile number to a different service provider will terminate your service with your existing provider; termination fees and other charges may apply. Some features may require added fees. Contact your service provider for more details. Use constitutes acceptance of Apple’s software license agreement and third-party terms located in the iPhone box. Unauthorized modification of your iPhone software violates the software license agreement. Inability to use an iPhone due to unauthorized modifications is not covered under your warranty.