Phone network bands are the radio frequency ranges a phone uses to talk to a mobile network, and an imported phone only works well where it supports bands that local operators use. Support varies by model and region.
This independent explainer is not affiliated with any phone maker or carrier. Readers new to the topic can start with the overview of chinese tech brands, since many imported phones come from that market.
Network bands in plain terms
A mobile network does not use one radio channel. Operators hold licences for particular slices of the spectrum, and each slice that the industry standardises is given a band number. A phone contains a radio and antennas built for a set list of those bands. If the phone does not include the band an operator has deployed in a given area, the phone cannot use that part of the network, even if the phone is unlocked and has a working SIM.
The bands are set by the standards body 3GPP. The LTE bands are defined in 3GPP TS 36.101, according to the Wikipedia list of LTE frequency bands, which reproduces the 3GPP tables. That list is a convenient reference, but the manufacturer page for the exact model remains the authority on what a phone supports.
Chipsets and modems are a separate subject from band lists, and the broader hardware story is covered in the china semiconductor industry guide. For this article the key point is simple: the modem and antenna design of a particular model decide which bands appear on its spec sheet.
LTE and 5G band naming
LTE bands are written as plain numbers. The Wikipedia list notes that band numbers can be written prefixed by a “b” as in “b66” for band 66, so one spec sheet may say B66 and another may say 66 without any difference in meaning. For 5G the convention adds a letter: the NR bands are defined with the prefix “n”, and when an NR band overlaps with an LTE band the two share the same band number. That is why a phone may list band 3 for LTE and n3 for 5G, both referring to the same 1800 MHz allocation.
Frequencies are the other half of the name. The LTE band list gives band 3 as a 1800 MHz band, band 20 as an 800 MHz band marked for the EU and band 71 as a 600 MHz band marked for the US. A band is a regional fact as much as a technical one, which is why the region notes matter on any list. Apple uses the same style on its 5G and LTE page, writing labels such as n78 (TD 3500) and LTE band 3 (1800 MHz), where TD marks a time-division band.
Mid-band 5G is where a lot of the activity is. The 5G NR band list describes n78 as a 3500 MHz C-band TDD band, and Apple lists n77, n78 and n79 in the same family of mid-band labels. Millimetre-wave bands are named in a higher range, with Apple listing n258 (26 GHz), n260 (39 GHz) and n261 (28 GHz) for some models.
Regional hardware variants
Phone makers often sell more than one hardware variant of the same model. Apple states on its regional page that readers should find the iPhone that is right for their country or region, and it publishes a separate table of 5G and LTE bands for each. The same page says all iPhone models connect to 5G and LTE networks around the world, but the lists of supported bands are not identical in every region.
Chinese manufacturers say the same thing in their own documentation. Xiaomi notes on a model FAQ that connectivity and network bands can vary based on regional availability and local operator support, and adds that availability can vary by carrier and that buyers should consult their carrier for details. In other words, a spec sheet for a phone is not always the sheet for the unit that ships to a particular country.
This matters most for people who buy a phone abroad and bring it home. Readers who travel for electronics can see how that market works in the hong kong electronics shopping guide. Whatever the destination, the model number on the box, not just the marketing name, identifies which band list applies.
Reading a band list on a spec sheet
Xiaomi gives a clear example on the Xiaomi 14 Ultra specification page. It lists the 5G NR bands first, then LTE FDD, LTE TDD, WCDMA for 3G and GSM for 2G. Each group has its own list of numbers. The page also carries a note that band 66 is narrowband.
A Xiaomi model FAQ describes the network formats of one flagship phone as GSM, WCDMA, LTE, SA and NSA. SA and NSA stand for standalone and non-standalone, two ways of deploying a fifth-generation network, and phones list the bands for each separately because a band can be supported in one mode and not the other.
- Match the list of LTE bands first, because LTE still carries calls and data in most places.
- Then look for the 5G bands that the operator uses, written with the n prefix.
- Check whether the band is offered in SA mode, NSA mode or both.
- Read any regional footnote, which marks where the listed model is sold.
Checking an imported phone before relying on it
The reliable way to answer the compatibility question has three parts: the exact model number of the phone, the band list from the manufacturer for that model number, and the list of bands the operator uses for coverage where the phone will be used. Where those do not agree, the operator is the authority on its own network.
Other things that affect real use sit outside the band list. An operator may have switched off an older network type, a phone may be locked to the carrier that sold it, and a phone may support a band without supporting every feature on it. Xiaomi tells buyers to consult their carrier for details, which is the right instinct for any imported phone. Radio exposure ratings are a separate topic from compatibility, and are explained in the phone SAR guide of this site.
A phone that lacks a local band usually still makes calls on the bands it does have, but coverage, indoor reception and speed can suffer. The extent depends on the operator, so there is no general rule to apply other than reading the lists.
Frequently asked questions
Are LTE band 3 and 5G band n3 the same frequencies?
Show answer
They refer to the same allocation. The Wikipedia band list notes that when an NR band overlaps with an LTE band, the two share the same number, with the n prefix for 5G.
Does an unlocked phone work on every network?
Show answer
No. Unlocking removes a carrier restriction, but the phone still needs to support the bands the local operator uses. Xiaomi notes that bands can vary by regional availability and local operator support.
Why do band lists differ between regions for the same phone model?
Show answer
Makers sell hardware variants for different markets. Apple publishes a separate table of 5G and LTE bands for each country or region.
What does the b prefix mean in a band list?
Show answer
It is a short way of writing an LTE band, so b66 means band 66, according to the Wikipedia list of LTE frequency bands.
