The baseband is a component of an iPhone that is responsible for processing and transmitting data. It is important to check your baseband if you are experiencing any issues with your iPhone’s connectivity or performance.
There are a few different ways to check your baseband. One way is to use the Field Test mode. To access the Field Test mode, dial 3001#12345# into your iPhone’s keypad. Once you are in the Field Test mode, tap on the “Serving Cell Info” tab. The baseband version will be displayed under the “Modem Firmware” section.