Assign new iTunes backup folder

I found this article helpful when researching how do I backup my old iPhone in iTunes before getting a new iPhone, I wanted to make sure I had a good local backup and I did not have enough space locally to accommodate my iPhone backup(s).

These are their steps that worked for me:

Changing the iTunes iOS backup folder on macOS
Launch the macOS Terminal application. This can be found using Finder, under Applications / Utilities / Terminal. Alternatively, it can be launched using Spotlight by pressing ⌘ Cmd + and typing “Terminal” before pressing ⏎ Enter.

Instruct the Terminal to change to the default iTunes backup location, by entering cd ~/Library/Application\ Support/MobileSync and then pressing ⏎ Enter.

Reveal the current backup folder in Finder by entering open . and then pressing ⏎ Enter.
The Finder window that opens will show a folder named “Backup”. This contains any iTunes backups which are already present on the computer. In order to change the backup folder’s location, this folder must be renamed, moved or deleted. As an example, one could rename it to “Backup (Old)”.

Once the “Backup” folder has been renamed, moved or deleted, a symbolic link can be created to the desired backup location. Use the following command ln -s [desired-new-backup-path] ~/Library/Application\ Support/MobileSync/Backup. Once this command has been entered, press ⏎ Enter and the change will be complete.

After restarting the Mac, iTunes will store its backups in the new location.

Big thanks to: https://reincubate.com/support/ipbe/change-itunes-backup-location/

IMEI number

Every wireless device comes with a 15- or 17- digit International Mobile Equipment Identity (IMEI) number.

How to find your your IMEI number?
The instructions below will help you locate your device’s IMEI number:
To find your IMEI, dial *#06# on your keypad. This will return your IMEI.

Alternatively, most phones provide a way to find your IMEI by going to the Settings menu. From there look for General, or About, and then scroll down to find your IMEI number.
You may also find the IMEI number under or below the battery, or on the back or bottom of the device. Look for a label like the one below to find your number.The IMEI graphic shows a bar code with numbers written above it. If you are visually impaired, please call AT&T Customer Service at 800.331.0500 for further help.

Help with your AT&T IMEI number
You must register your device’s correct IMEI with AT&T to access certain plans or features. For help with IMEI-related issues, visit the Troubleshoot & Resolve Tool.