Network Locked
My new iPhone 15 Pro requires what was said to be "network unlocked" before I can use it. I got it in Atlanta but now I am in Harare, Zimbabwe
My new iPhone 15 Pro requires what was said to be "network unlocked" before I can use it. I got it in Atlanta but now I am in Harare, Zimbabwe
Carrier Lock or Activation Lock?
Carrier Lock:- Though your iPhone’s original Carrier is not obligatory to unlock your iPhone, but you may know the process here --> How to unlock your iPhone for use with a different carrier ...
If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Learn how to remove a device from a previous owner's account.
If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their apple ID.
Carrier Lock or Activation Lock?
Carrier Lock:- Though your iPhone’s original Carrier is not obligatory to unlock your iPhone, but you may know the process here --> How to unlock your iPhone for use with a different carrier ...
If you are the owner or the owner has shared all information with you then to open Activation Lock:- If it is Activation locked, read here --> Turn off Activation Lock - Apple Support Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Learn how to remove a device from a previous owner's account.
If you are not the owner and do not have the Apple ID and Password then there is no way that you can get into this iPhone unless the original owner shares the Apple ID and password with you. If you are lucky you can get into this iPhone if they (owner) accidentally remove the device from their apple ID.
To be able to use any SIM across the globe you must have "No SIM Restriction" against Network Provider Lock. Please refer to the pic below.

Carrier Lock:- Request your iPhone’s original Carrier to unlock your iPhone and if they agree and do it, then you may know the further process here --> How to unlock your iPhone for use with a different carrier ...
Device Unlocking Policies | Verizon Privacy Policy
Unlock a Phone or Device - AT&T Device Unlock Portal
Unlocking your Sprint device - T-Mobile
FAQs about unlocking your Sprint device
Unlock Your Phone for Spectrum Mobile
Network Locked