WebApr 5, 2024 · To find out what cellular band (s) your iPhone is connecting to, follow the steps below: 1) Launch the Phone app from your Home Screen. 2) Dial *3001#12345#* and then tap on the green Call button. Note: This won’t place a phone call, but it will open the iPhone’s hidden Field Test Mode app. WebJul 18, 2024 · Unstructured Supplementary Service Data (USSD)—sometimes known as "quick codes" or "feature codes"—is an extra-UI protocol, which allows people to access hidden features. This …
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