Are you trying to make sense of the Field Test Mode
setting for the iPhone? This video serves
as a guide to the two working options
and covers the iPhone 6 through 10
as well as Verizon, Sprint,
AT&T and T-Mobile.
There are two primary chipsets used in the iPhone
Qualcomm chipsets are generally used for
Verizon and Sprint and Intel chipsets that are primarily used for AT&T and T-Mobile.
Which chipset your phone has will determine which
menu you'll receive in Field Test Mode.
If you want to know the specific model
that ties to the chipset you're looking for
take a look at this table. It represents
all of the newer iPhones and the actual model
number whether it's a Qualcomm or whether it's an Intel
or Other. Now some of the other ones are
for Japanese markets or other international locations.
They may work with Qualcomm
or Intel chipsets depending on that model.
On some of the phones the model number is
printed in very fine print on the back of the phone
but if you want to determine which one that you have you can lookup
the model number based on the part number of your phone.
To determine the part number go into Settings,
General, About
and take a look at the part number listed at the
lower portion of the screen.
This part number cooresponds to the model number
of your phone. For example,
in the iPhone 8 I have model
MQ722LL/A
which cooresponds to the 64GB,
space gray iPhone 8 from Verizon.
Once you find your model number in the list
and determine it is a Qualcomm or
Intel chipset then you know which menu you will
receive when you go into Field Test Mode.
As I mentioned earlier Qualcomm is generally
Verizon or Sprint
and Intel is generally AT&T or T-Mobile.
If you have the Qualcomm
chipset simply go in to your phone,
dial *3001#12345#*
and hit dial.
This will take you to the Field Test menu.
Click on 1xEV-DO
and the decibel measure number you are looking for
is Rx AGC0.
Now a couple of notes about the Qualcomm chipset.
It doesn't work
quite as efficiently as the Intel chipset does.
If you exit out of this
phone mode right now
you'll actually have to restart
your cell phone in order to be able to get back in
and see these menu options.
There's also been reports that some of the menu options
don't come back with data
so I'd encourage you to do a power recycle
and go in there and see if it works the very first
time. For this chipset the dBm
signal strength should be in this range.
Now remember these numbers are negative numbers so the closer you get
to zero means that the larger number is a better signal.
So for AGC0 measurements
anything greater than -70
meaning closer to zero is an
Excellent signal.
From -70 to -85 is Good signal.
From -86 to -100
is a Fair signal.
And anything less than -100 is
a Poor signal. When you get to -110 you'll have no signal and no service at all.
For the Intel chipset you do the same thing. Go in to your phone,
dial *3001#12345#*
and hit dial.
That brings you to the Field Test menu.
This menu is quite a bit different.
Click on LTE
and go to Serving Cell Meas
and the number you are looking for is rsrp0.
The good news with the Intel chipset is that you can
go back and forth through the menus, you can exist out
of the phone and come back and
dial the number again and it will still connect to Field Test
Mode and display these numbers.
The decibel signal strength works similar
but has a little bit different range.
Anything greater than -90 is an Excellent
signal. -90 to -105 is
a good signal.
-106 to -120 is a
Fair signal
and anything less than -120 is
a Poor signal.
When you reach -125
you'll have no signal at all.
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