Field Test Mode

Posted on: April 24, 2023 /

Every Apple iPhone has a hidden "Field Test Mode" that can be accessed by dialing a special "*3001#12345#*" phone number from the main dial-pad.

From within this mode, you can dig up details about your cellular connection that are not normally available, such as your raw signal strength, currently active LTE band, and whether or not carrier aggregation is active.

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