On iOS 15, you might find rsrp in the " Rach Attempt" section. If you have a supported iPhone model running iOS 11 or later, in the Field Test mode, find "Serving Cell Meas" for LTE, then look in that section for the rsrp0 number, which is the one you want for your reception in dBm. In iOS 10 and earlier, using this code would show the dBm in place of signal reception bars, but you have to dig a bit deeper into iOS 11 and above to see these numbers - and it doesn't work on all iPhone models. However, you can get a better idea of your reception by looking at the dBm (decibel-milliwatts) numbers. Much of this is useless to us, but it's still fun to dig through. This will show you the Field Test tool, which has data on your SIM card, cellular connections, and more. Use the code *3001#12345#*, then hit the call button. Don't Miss: How to Hide Private Photos on Your iPhone.If not, you'll need to hit the green "Call" button. Also, with some of these codes, after you enter the last digit or symbol, it may immediately work its magic. When you see XXXXXXXXXX in any of the codes below, that indicates the seven-digit phone number with area code, for a total of 10 digits that you're calling. However, as stated above, some of these codes only work on certain iPhone models or with specific wireless carriers, so your mileage may vary depending on what combination you have. We've compiled a list of functional dialer codes that you can use on your iPhone and tested almost all of them out, so don't expect to see any fake codes that promise wealth and unlimited power. There are some sites and chain emails that list too-good-to-be-true codes, such as dialing *3370# to unlock hidden battery reserves, so you can't trust everything (that code actually reduces power on some Nokia handsets by providing better sound quality for calls). Others only work on particular carriers and/or specific iPhone models (GSM vs. While some codes have stopped working, newer ones have appeared.
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