What is the difference between GSM unlocked and fully unlocked?

Related questions

1. Can you use a CDMA phone on a GSM network?
2. What is the difference between GSM unlocked and factory unlocked?
3. Are there unlocked CDMA phones?
4. Are iPhones CDMA or GSM?
5. Can a phone be locked after being unlocked?
6. Will an unlocked GSM phone work on Verizon?
7. Can I buy an unlocked phone and use it with AT&T?
8. Can GSM unlocked phone work internationally?
9. What does GSM unlocked vs fully unlocked?
10. Is iPhone 7 Plus GSM or CDMA?

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