23-02-2022 12:49 PM
23-02-2022 01:50 PM - edited 23-02-2022 01:52 PM
Perhaps because SIM PIN locking is enabled?
You seem to be using an iPhone so these links may be of relevance:
https://support.apple.com/en-ie/HT201529
https://www.iphonetricks.org/how-to-remove-iphone-sim-lock-and-prevent-it-from-reoccurring/amp/