With the iPhone 5, I don't believe you have to tell Sprint anything. You just go into the settings [on the phone] and turn on Hotspot. You can then use your laptop or any other device to connect and use your data connection. If you have a metered connection, you will eat up your data faster.
I have done this in the past and you should be prepared that the speed is not so good, even if you have a 4G connection. But, it'll do in a pinch.
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