SIM (Subscriber Identification Module) card is a specially programmed microchip that stores network identification data. It helps Sprint's network identify you as a customer. 

SIM cards are small, removable smart cards used to store data like your mobile phone number and the phone carrier you use. When you bring your device to Sprint, you’ll need to replace your existing SIM card with a Sprint SIM card so that our network can identify you as a customer. We’ll walk you through the steps of popping out your old SIM and inserting ours. 

No. Your device will activate with all applicable Sprint settings during the activation and provisioning process.

Your old carrier will have to domestically unlock your Apple devices before you can bring them to Sprint. Nexus 5 and Moto X Pure Edition devices are already domestically unlocked. Nexus 6 is already domestically unlocked—with the exception of Nexus 6 devices on AT&T.

A domestic SIM unlock allows you to insert a Sprint SIM card into your device and attempt to activate it on the Sprint network. Unlocking your device will not necessarily make it interoperable with the Sprint network. In other words, a device designed for one network is not compatible with another network merely by unlocking it. Additionally, unlocking a device may enable some functionality of the device but not all (e.g. an unlocked device may support voice services but data services may not work or may be limited when activated on the Sprint network). Visit a Sprint store to check your device's compatibility.

• Unlocking your Apple device will not necessarily make it interoperable with the Sprint Network.
• A device designed for one network is not compatible with another network merely by unlocking it.
• Due to this limitation, some devices aren't eligible.

No. Bring your own device is only compatible with the postpaid plans we currently sell for consumers and business.

The International Mobile Equipment Identity (IMEI) number is a 15-digit serial number that identifies your wireless device. It is important to have the correct IMEI number for your device registered with Sprint to ensure that your device can be activated on our network.

If you have an AppleCare agreement, please refer to the terms and conditions of your agreement. Visiting an Apple Store may be best to help you troubleshoot your issue under your AppleCare agreement. If you have Total Equipment Protection through Sprint, please visit a Sprint store near you. If you have device protection through your old carrier, it will have to be canceled and a new protection policy may be available through Sprint.

AppleCare moves with your device. Your AppleCare agreement should remain active if you bring your device to Sprint.