field test mode iOS 11

Field test mode works for me on iPhone 8 Plus. *3001#12345#*

The ability to replace bars with the signal strength number was removed with the 10.3.1 update and there is no way to do that now. Take a look under Serving Cell Measurement. That is generally where your dBm indicators are located. Also several people have told me that they need to reboot the phone to get the numbers to show up. More often for the Qualcomm chipset.

OK, after just commenting that I couldn’t get into FTM, I played around with sequence of trailing * & #, with no luck, then came back to original string *3001#12345#*

and it got me into FTM. Don’t know why after trying 5-6 times previously w/o restarts etc.

So I’m in but not seeing way to get dBm.

On iPhone 8, OSX11.??, T-Mobile

You can still see the field test mode decibel number on most phones but the old method is gone and no news of it coming back. Here is a guide that may assist: iPhone Field Test Mode Guide - YouTube

You can use this workaround for iOS 11. It works for most people. iPhone Field Test Mode Signal Strength Indicator - YouTube

Hi All,

Actually to get the Signal Bar on Top Left Corner to Display the -XXXdBm Permanently, it would be:

1) *3001#12345#*

2) Press Power button until showing Power Off slider. Do not 'off'

3) Press Home button until Field Measurement App exit to toggle display mode.

Well at least it always worked for my iPhone 6 iOS 10.3.1.

Now I have a question, I just bought iPhone X and there is NO HOME button!!! So how on earth do I make the dBm -XXX display Permanently on the Signla Bar??!!

It does not display in the upper left on the home screen anymore. The chipset/carrier for your phone does make a difference and usually not the iOS update. If you don't have the settings in the field test menu now you probably won't find them with the latest update. I've seen it work on iPhones with T-Mobile and Verizon with iOS 10.3.2 and higher in the menu under Serving Cell Meas/rsrp0 and under Measurement RSSI. However, some people are saying they can't find either of those menu options with their chipset/carrier.

Double check this video to see if you have either of the menu options for field test mode. iPhone Field Test Mode Guide - YouTube. You won't be able to make the bars change to decibel numbers but you may be able to find the signal strength indicator.

I have read that Apple won’t bring field test back because they say it is not accurate. Thay won’t tell you what the signal strength for the bars is. They claim it is per carrier. Verizon won’t tell you either. They don’t want you to know how bad their signal is especially if you live in a marginal area like I do. Can’t get service from another carrier. They are all the same-not customer friendly.

We are all users here. I would contact Apple.Feedback - iPhone - Apple

Submit your feedback to Apple here:

http://www.apple.com/feedback

This site splains chip/carrier variations for Field Test Mode, read to below the video:

https://www.repeaterstore.com/pages/field-test-mode

Try this updated information. It shows a couple options: iPhone Field Test Mode Guide - YouTube

daverleigh wrote:

Never **** off your customers. Right?

Apple asterisks their customers quite regularly. The Apple way has always been for them to give us what Apple decides we need. Some people are okay with that, some aren't.

Submit your feedback to Apple here:

http://www.apple.com/feedback

Those instructions work with iOS 11.1.1 and it gives you the signal strength number. Yes, they have removed the ability to get it on the top in place of the signal bars but at least you can get the dB numbers from within the field test mode menu. It is a viable workaround.