Default Buy a BAD ESN phone ?

Hello guys I have some questions about BAD ESN phones (sorry I'm a moroccan tennager and I don't speak english very well)

- What kind of bad esn phones can I buy (models) because people said that it's too hard to unlock an iPhone ?
- Can you give me tutorials to unlock those phones ?
- Can I use them to send messages ? In 3g/4g ? To call ?
- If I buy a SPRINT or VERIZON bad esn phone, can I use it in morocco with just unlocking the sim ?

Thank you

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