Most smartphone users are faced with a dilemma: built-in FM tuner requires wired headphones, and modern wireless solutions such as TWS headsets, seem incompatible with classical ether. This situation arises due to fundamental differences in signal transmission architecture and antenna requirements. Wired headphones physically act as an antenna for a radio chip, while Bluetooth the protocol transmits an already digitized audio stream, creating a technical barrier to directly connecting an analog signal.
However, the industry does not stands still, and chipset manufacturers, such as Qualcomm and MediaTek, are gradually introducing solutions to circumvent this limitation through software interfaces. In this article we will examine in detail why the standard method does not work, what exist workarounds through specialized applications and how to configure the data flow for minimal latency. You will learn about the real capabilities of your device and whether it is worth wasting time searching for non-existent settings or whether it is better to switch to Internet broadcasting.
Technical limitations of directly connecting an FM tuner
The main reason why you cannot simply press the “Enable” button in the standard application “Radio” and hear the sound in Bluetooth headphoneslies in the physics of the radio. Built into a smartphone FM chip (usually part of the main modem or audio processor) requires connection to a physical antenna to capture electromagnetic waves in the 87.5-108 MHz range. In 99% of cases, the role of this antenna is performed by a wired headset cable, which is connected via a 3.5 mm connector or USB-C.
Wireless headphones do not have direct electrical contact with the phone's radio module. The signal from the antenna (which they don't have in the context of the FM band) cannot get to the chip, and even if the phone were to somehow miraculously receive the signal through the internal antenna (which only a few flagships support), the Android software by default redirects the tuner's audio output exclusively to the wired port. This is done to save energy and prevent audio routing conflicts in the system Android Audio HAL.
⚠️ Attempts to use third-party applications that promise to “turn on FM wirelessly” on regular smartphones without support for this function at the driver level, often lead to the installation of malware or simply display a stub asking you to connect a cable.
There is a rare exception: some smartphones that for example, some models from LGE or HTC in the past had built-in antennas that did not require wires. However, even in such devices, support for audio output was often blocked by manufacturers at the software level. Therefore, if the characteristics of your device do not explicitly indicate the presence of “FM Radio over Bluetooth”, you should not count on regular operation. Bluetooth interface often blocked by manufacturers at the software level. Therefore, if the characteristics of your device do not explicitly indicate the presence of “FM Radio over Bluetooth”, you should not count on normal operation.
Alternative methods of listening to the air
Since directly connecting an analog tuner to a wireless interface is technically difficult to implement for the mass consumer, the main solution is to switch to digital plane. Instead of receiving radio waves from the phone's antenna, the device downloads the audio stream over the Internet. For this purpose, radio station aggregators are used, which broadcast in real time through servers. This allows you to listen to your favorite stations through any headphones, including the cheapest TWS models.
Popular applications such as TuneIn Radio, Radio Garden or Simple Radiogive access to thousands of stations from around the world. Unlike the built-in FM tuner, these services are independent of the signal quality in your area and do not require an antenna. However, here the factor of traffic consumption comes into force: listening to radio in high quality (128-320 kbit/s) can consume from 50 to 150 MB of data per hour, which is critical in the absence of an unlimited tariff.
For users for whom it is critical to save traffic, but at the same time use wireless headphones, there are hybrid solutions. Some telecom operators offer "Free Radio" options, where the traffic of certain applications is not charged. It is also worth paying attention to the function offline cachingavailable in premium versions of some players, although it is of limited use for live broadcasts.
Software solutions and workarounds
For advanced users who own smartphones with unlocked Bootloader and rights Rootthere are theoretical possibilities to change sound routing. Using utilities like Sound Assistant (for Samsung devices) or modules Magaisk, you can try to force the system radio audio stream to be redirected to a Bluetooth device. However, this requires deep knowledge in the field of modifying system files audio_policy.conf.
Owners of processor-based smartphones Qualcomm can sometimes activate hidden functions through the engineering menu. It is usually accessed by dialing a code into the phone, for example ##4636## (the code may vary depending on the model). Inside the test menu, you can find the "FM Radio" section and check if there is an option to select an audio output device. If this option is present and active, you will be able to listen to real FM broadcast wirelessly.
Risks of using the engineering menu
Changing settings in the engineering menu can lead to unstable operation of communication modules, loss of warranty and even “bricking” of the device. Proceed only if you understand the consequences of each step.
It is also worth mentioning specialized applications from chip manufacturers, which are sometimes pre-installed on smartphones in certain regions. For example, the application NextRadio (now discontinued, but having analogues) allowed the use of a built-in tuner and had experimental support for Bluetooth on some devices. Check for similar system applications in the “Tools” or “Google” folder on your device - perhaps the manufacturer left this option, but hid the icon.
Technology comparison: Analog FM vs Internet radio
The choice between using the built-in tuner (with wires) and Internet applications (with Bluetooth) depends on your priorities: connection quality, autonomy or convenience. Below is a table comparing the key parameters of these two approaches so you can make an informed decision.
td>Mono/Stereo (signal dependent)
| Option | FM tuner (Wired) | Internet radio (Bluetooth) | FM tuner (Special BT support) |
|---|---|---|---|
| Traffic consumption | 0 MB | ~60-150 MB/hour | 0 MB |
| Network dependence | Tower coverage area only | 3G/4G/Wi-Fi required | Tower coverage area only |
| Sound quality | Stable stereo (AAC/SBC) | Mono/Stereo (depending on the signal) | |
| Autonomy | High (low power consumption) | Medium (modem operation + BT) | High |
As can be seen from the table, classic FM radio wins in emergency situations when cellular networks are overloaded or there is a power outage (base stations operate on batteries for a limited time, and FM transmitters are often self-powered). However Bluetooth connection in conjunction with Internet radio provides incomparably greater ease of use, freedom of movement and access to global content, and not just local stations.
If your goal is to save traffic and work in conditions of poor cellular communication, wired headphones with The FM tuner remains the uncontested leader. For comfort in the city, choose Internet aggregators.
Setting the sound quality and codecs
When using Internet radio via Bluetooth, the playback quality depends not only on the bitrate of the stream, but also on the one used audio codec. Standard codecs SBC and AAC provide acceptable quality, but for music and high-quality broadcasting it is better to use advanced protocols such as aptX, aptX HD or LDAC. You can check codec support in the Android developer menu.
To activate advanced settings, you must enable developer mode. Log in Settings → About phone and quickly click 7 times on the “Build number” item. After this, a new section “For Developers” will appear in the settings menu. Find the “Bluetooth Audio Codec” item there and select the highest quality option supported by your headphones. This will reduce losses when compressing the audio stream coming from the radio application to the headset.
☑️ Optimizing sound for radio
It is also worth paying attention to the audio delay (latency). This isn't a big deal when listening to news or entertainment, but if you're watching a video broadcast from a radio station or syncing the radio to another audio source, the 150-200ms delay may be noticeable. Codecs aptX Low Latency are specially designed to minimize this effect, but require support from both the smartphone and headphones.
Common problems and ways to solve them
Even when using Internet radio, users may experience interruptions in playback. A common problem is disconnection when locking the screen or switching applications. This is due to aggressive battery optimization in Android skins (MIUI, EMUI, OneUI), which “kills” background processes. To avoid this, find your radio app in the battery settings and set the operating mode to “Unlimited” or add it to the whitelist.
Another common complaint is quiet sound or no sound from one earbud. In such cases, resetting Bluetooth settings helps. Go to Settings → Applications → Show system processes → Bluetooth, clear the cache and data, and then reconnect the headphones. Also make sure that the mono sound function is not activated in the radio application itself, unless you use it deliberately to save battery.
⚠️ Attention: Settings interfaces and menu item names may differ depending on the version of Android and the manufacturer's shell. If you do not find the described path, use the search in your phone settings.
If the radio is constantly buffering, try changing the broadcast server inside the application (if there is such an option) or switching from the mobile network to Wi-Fi to check. The problem may not be with the phone, but with the radio station’s server being overloaded during peak hours. In such cases, switching to a mirror broadcast or another station on the same network often solves the problem instantly.
FAQ: Answers to popular questions
Is it possible to flash a phone so that the FM radio works with Bluetooth?
Theoretically, yes, if the smartphone hardware supports tuner audio output to a digital interface, but it is blocked by software. However, it is extremely difficult to find such firmware, and the risk of damaging the device is very high. For most models, such a solution does not exist in nature.
Why do some phones do not have a Radio application at all?
Manufacturers are increasingly refusing to install FM chips or not connecting antenna contacts on the board in order to save space and reduce the cost of the device. In such models, the radio equipment is physically absent or inactive, so no applications will help.
Does a low headphone battery affect signal reception?
No, if you listen to Internet radio. The signal is received by the phone's modem. However, if you were to use a specific circuit with analog signal transmission (which almost never occurs), then the charge level would not affect the antenna properties, but would affect the operation of the headphone amplifier.
Is there a difference in quality between FM and the online version of one station?
Yes, significant. FM broadcasts are often bandwidth limited and compressed for broadcast transmission, plus they are susceptible to interference. The online stream is usually transmitted in a bitrate of 128-320 kbps, which provides cleaner sound, no hiss and a stereo effect that is unattainable for many local FM transmitters.
For maximum sound quality when listening to online radio, try to use a Wi-Fi connection, since the mobile network can dynamically reduce the bitrate of the stream when the signal deteriorates, which will immediately will affect the sound.