Current Connection: Spectrum, CNA

Bands in use

Across the top, up to four cards detail each band your connection is using. Each card is colour-coded by technology (2G, 3G, 4G and 5G each have their own colour), and the primary serving band is tagged. A small line above the cards notes the radio state, for example "Connected, serving carrier(s)".

These cards list even more per-carrier detail than the Geographical view. Every field is explained below.

💡 Swipe to switch. Reach this screen with a swipe left from the Geographical view, and swipe right to go back, without returning to the main screen.

The band card parameters

Each card describes one carrier. Band and technology names follow the 3GPP standard, so the labels match those used across the industry.

The cards sit at the top of the screen, one per carrier. Below them, two full-width panels place those carriers onto the downlink and uplink spectrum. Keep the screenshot in view as you read the fields.

Spectrum view band cards — The Spectrum view.

Field	Meaning
Band label	The 3GPP band, coloured by generation: LTE bands are written B3, B8 …, 5G NR bands n1, n78 …, plus a "primary" mark on the serving band.
Name	The band's nominal centre frequency and its 3GPP band name, for example 1800 MHz (DCS), 900 MHz (E-GSM), 2100 MHz.
Band BW	The total width of the operator's licensed band (the whole allocation, not just your carrier).
ARFCN	The channel number that identifies the exact frequency: EARFCN on LTE, NR-ARFCN on 5G, UARFCN on 3G, ARFCN on 2G (shown here generically as (E)ARFCN).
DL freq	The downlink centre frequency in MHz that the channel number maps to.
Carrier BW	The bandwidth of the actual carrier you are using inside the band, for example 10, 20 or 100 MHz.
PCI	The physical-layer cell identity on the air interface: PCI on 4G/5G, PSC on 3G, BSIC on 2G. It distinguishes neighbouring cells on the same frequency.
RSRP	Reference-signal received power, i.e. the signal strength of this carrier (dBm).
RSRQ	Reference-signal received quality, i.e. the signal quality of this carrier (dB), which also reflects interference and load.

⚠️ What you see depends on your phone. Secondary carriers in particular are poorly reported by many modems, so a card field or an entire carrier may read "N/A" or be missing even when the connection works perfectly. In the example the 5G n1 carrier's RSRP and RSRQ read N/A for exactly this reason.

How the spectrum picture is built

Below the cards, two full-width panels place those same carriers onto the real radio spectrum: one for the downlink, one for the uplink.

One block per band, ordered by increasing frequency, with a frequency scale (MHz) along the bottom.
The carrier in use is highlighted inside each band block, so you can see exactly where in the band your phone is tuned.
The serving band is marked "PRIMARY". In the example the primary is B3 (1800 MHz DCS), with B8 (900 MHz) and the 5G n1 (2100 MHz) carrier alongside it.
TDD bands, where uplink and downlink share the same frequency, appear in the downlink panel and are tagged as such.
Question marks. Uplink carriers of non-primary bands are marked "?", because the phone does not confirm whether it is actually transmitting on them; CNA shows them, but is honest that their use cannot be verified.

Colour ties the two panels together: each band keeps its technology colour, so it is easy to trace a band from its card to its place on the downlink and uplink scales.

Bands in use

The band card parameters

How the spectrum picture is built

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