Updating an iPhone that was unlocked by jailbreaking it may cause it to be relocked or other issues. If the iPhone was properly and officially unlocked by the original carrier it was locked to, then no, it will never re-lock to a carrier again.
Not Now | Update It is safe to accept this update – it nearly always is with iOS devices, because it's so much harder for malware and viruses to break into the closed operating system (although there are iOS viruses – read our guide to iPhone security for more on that).
You can manually check for and install a carrier settings update with these steps:
How to manually update the carrier settings on an iPhone
Update your carrier settings manually on your iPhone or iPad
Carrier settings updates let your carrier provider update carrier network and related settings to improve cellular network connectivity and performance. Carrier settings updates can also add support for new features like 5G or Wi-Fi Calling. When a carrier settings update is available, you'll be prompted to install it.
Carrier settings updates are small files that are installed on iOS devices. The carrier settings include updates to Access Point Names (APNs), MMS settings, features like tethering and default apps. Having the most up to date carrier settings is recommended for the proper functionality of the device.
Re/code says most updates are safe to download, but there's no harm in waiting either.
Yes, carrier settings update is legit from Apple in conjunction with Verizon and should be accepted. Carrier settings updates let your carrier provider update carrier network and related settings to improve cellular network connectivity and performance or add support for features like VoLTE or Wi-Fi Calling.
Go to Settings and then select More and the Mobile Networks, now select Carrier Settings and then Update Profile, this should update the latest carrier settings to your device if they are available.
If you don't, follow these steps:
Carrier settings updates let your carrier providercarrier providerA mobile network operator (MNO), also known as a wireless service provider, wireless carrier, cellular company, or mobile network carrier, is a provider of wireless communications services that owns or controls all the elements necessary to sell and deliver services to an end user, including radio spectrum allocation, update carrier network and related settings to improve cellular network connectivity and performance. Carrier settings updates can also add support for new features like 5G or Wi-FiWi-FiWi-Fi or WiFi (/ˈwaɪfaɪ/) is a family of wireless network protocols, based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves. Calling. When a carrier settings update is available, you'll be prompted to install it.