Open the “Phone” app on your iPhone and enter the following number exactly:.

The iPhone must have an active cellular connection to be able to access and use Field Test Mode to measure the signal strength, the rest is easy: How to Use Field Test Mode in iOS 13 / iOS 12 / iOS 11 to See Number Cell Signal Strength on iPhone

Read on to learn how to access Field Test Mode in iOS 11.x or newer on any new iPhone, including iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone XR, iPhone XS, iPhone XS Max, iPhone X, iPhone 8, iPhone 8 Plus, iPhone 7 Plus, iPhone 7, and others. Not to worry, you can continue to see the cellular signal as numbers on iPhone with Field Test Mode in iOS 13, iOS 12, or iOS 11, it just works a bit differently than it did before in prior versions of system software. But ever since iOS 11 and later and new iPhone models, Field Test Mode is different from how it used to be, and if you enter Field Test Mode in iOS 12 or iOS 11 you will not immediately see the numerical dBm cell signal indicator replacing the bars.

Rsrq signal meaning