Can a phone be locked after being unlocked?

Related questions

1. Are iPhones CDMA or GSM?
2. Do unlocked cell phones work with any carrier?
3. Can I just put my SIM card in an unlocked phone?
4. Is iPhone 7 Plus GSM or CDMA?
5. What does GSM unlocked vs fully unlocked?
6. Is Verizon a GSM or CDMA network?
7. Can you use a CDMA phone on a GSM network?
8. What phones are compatible with CDMA?
9. What is the difference between GSM unlocked and factory unlocked?
10. Does GSM unlocked work internationally?

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17. #phones