The related article mentioned above might also help further explain: How to unlock your iPhone for use with a different carrier
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⏺ If you can't accept iCloud Terms and Conditions... Learn more >
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⏺ If you can't accept iCloud Terms and Conditions... Learn more >
⏺ If you don't see your iCloud notes in the Notes app... Learn more >
The related article mentioned above might also help further explain: How to unlock your iPhone for use with a different carrier
Your phone is carrier locked. You either need a sim card from your carrier or ask them to unlock your phone.
When I inserts a sim it is telling me the sim is not valid