Service can be available, limited, etc.

LU is the location update status. While disconnected(but still logged in), and the phone is moved to another location area, the phone should perform a location update so that the carrier knows where to find it. The carrier has to be able to find it so that the phone can be notified if there's an inbound call. Logging in is also a type of location update.

MM is about logging in for getting voice/text services to towers to the phone, though ConnectionActive indicates that services are in use.

GMM is about logging in for getting data services to towers to the phone. It is only for getting data services to towers, logging in to get data to the APN may fail silently.

A phone is registered/attached if logged in.

To detach is to log out.

NoCell is a loss of signal.

PlmnSearch is that the phone is searching for carriers.

NoIMSI is that there is no valid SIM. However, it may also mean that the phone is not valid.

RoNotAl/LANotAl - refer to Cause, but the exact cause value is not displayed by this variant of the software, use *#9900# or other alternatives.

What it is meant to be used for is that if the phone has an inbound call/text, all towers in the LAC notify the phone so that it can notify the carrier of which cell it is currently in and begin to receive the call in it. If the phone moves to another LAC, it notifies the carrier so that the carrier knows where to find it.

What it is meant to be used for is that if the phone has data to receive, all towers in the RAC notify the phone so that it can notify the carrier of which cell it is currently in and begin to receive data in it. If the phone moves to another RAC, it notifies the carrier so that the carrier knows where to find it. 3G may instead notify based on URAs/cells.

Refer to RRC - similar.

The type of signal currently used. 2.4GHz and 5GHz in Wi-Fi are like two bands in 3G. However, each channel can only be 5MHz wide, and each channel is normally a pair of channels that are not next to each other in frequency.

The receive channel number and the transmit channel number.

It is the downlink channel number, tower->phone, refer to uarfcn, but note that accuracy of the value may be lost if the band is not Band 1.

It is the uplink channel number, phone->tower, but note that accuracy of the value may be lost if the band is not Band 1. Generally, there is no need to take note of these, because the UL uarfcn can be derived from the DL uarfcn.

Cell Identity, it contains the RNCID, tower, and part-of-tower the phone's currently on. It is referred to as the longformat in CellId. There is a notable difference, being that the CID displayed here is hexadecimal. Hexadecimal means that instead of counting with 0,1,2,3,4,5,6,7,8,9, counting is done as 0,1,2,3,4,5,6,7,8,9,a,b,c,d,e,f, making 15 be considered a single digit 'number'. The last 4 characters are used for identifying the tower/part of the tower, and the first characters are used for identifying the RNC. Conventionally, the last digit of a CID (decimal, short) identifies a part of the tower, and other digits of a CID (decimal, short) identifies a tower. This is by convention and may differ, for example, the first digit may identify a part of a tower.

RI counts all of the signal around the channel number. It counts useful signal, it counts useless signal (e.g. interference) too, it counts indiscriminately. Though it is given to other apps that use standardized APIs, if there is intention to use a metric associated with the distance to the tower and other factors, the metric to use is RSCP, which counts the testing signal emitted by the tower that's in a known sequence. RSCP-EcIo=RSSI.

Amount of extra signal. Extra signal includes resource utilization (downloads transferred to phones), and interference from other cells (coverage from other 'routers' installed on cell towers) on the same channel number.

A high (close to 0) Ec/Io during a download is not optimal, and might indicate a speed cap or that the tower doesn't have a fast internet connection.

While idle, a high Ec/Io is optimal, and indicates that the quality of the signal is great.

If 3G is in use by others, the quality of the signal worsens.

3G fails if the Ec/Io is around -20, e.g. too many 3G towers reach the phone's location.

If the Ec/Io is bad, error correction data must be added so the phone continues to understand what the tower says. Error correction data are also considered extra signal, so the Ec/Io goes down further, affecting others.

This is simply the signal strength of the test signal sent by the currently camped on part-of-the-tower.

This scrambling code is used for quickly identifying different cells. There are only 512 of these, so duplicates may be found in other locations. The cell currently in use lists PSCs of nearby cells so the phone can quickly find those.

Discontinuous reception. Reception is not discontinuous because the signal is poor, it is discontinuous to save energy.

The audio codec and bitrate for calls.

Audio formats for calls, it may contain:

Settings that describe 4G networks were/were not loaded from the tower, i.e. Received / Not Received.