Assuming you have purchased a code from a trusted provider.
If you want a reliable connection that will not break during system updates, you should skip temporary ICCID bypass methods and choose an official network unlock. 1. Official Carrier Unlock (Best Method) unlock sim iccid unlock tool
Here is the technical breakdown:
It is a unique printed on the back of every SIM card. Assuming you have purchased a code from a trusted provider
If Apple patches the ICCID, your phone may become locked again until a new code is found. unlock sim iccid unlock tool