Flip phone sim to the iPhone 5?

Recently my parents iPhone 5 contract with att has ended, so they are getting the iPhone 6 and my dad is giving me the iPhone 5. Can I take out the sim from my old cheap flip phone and cut it to use in the iPhone 5. Will it force me to pay more for the phone. My mom says it will force me to pay for the lte.Is this all true or not?

Yes, you will have stop by att and pay the $30 (or however much) per month to use lte

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