Does iphone 5 need a sim card for sprint?

Does iphone 5 need a sim card for sprint?

No, sprint is a CDMA carrier

It is true that you do not need a SIM card in order to use your iPhone 5 with Sprint.

However, since there's a SIM card slot in your iPhone, you may be able to use your Sprint iPhone 5 when traveling internationally.

See the link below for Sprint's policy regarding unlocking your iPhone 5's SIM card slot when traveling outside of the USA.