Can my Sprint Samsung Galaxy S4 work on AT&T?

Dan's friend broke his phone, and he wanted to let him use his old Samsung Galaxy S4 phone. But Dan has Sprint and his friend has AT&T. Leo says he can try it by just slipping his old SIM into it. If it doesn't work, he'll know. If not, then it's time to get a new phone. But all new mobile devices are LTE now, so they can be used on other networks.