Bluetooth Not Connecting on Phone? Fixes for Car, Earbuds, Watch

The car’s screen says “connected”. The phone says “connected”. Nothing plays. Bluetooth not connecting shows up in a dozen forms like that: earbuds that won’t pair, CarPlay or Android Auto dropping every few minutes, music stuttering on a walk, a watch that loses the phone overnight.

These problems spike after operating-system updates, and most are fixed by clearing the pairing on both devices and starting again. Here’s the order to try things in, then what to do for cars, earbuds and watches specifically.

Try these first, on any phone

1. Switch Bluetooth off properly. On an iPhone, use Settings › Bluetooth; the Control Center button only disconnects accessories. On Android, use the quick settings tile or Settings › Connected devices.
2. Restart both ends. Turn the phone off and on, and power-cycle the accessory: earbuds back in the case, watch restarted, car switched off and on.
3. Charge the accessory. Earbuds and watches low on battery often refuse to reconnect.
4. Disconnect everything else for a moment. If the problem disappears, one of the other devices was causing it.
5. Forget the device on both ends and pair from scratch. The steps for iPhone and Android are below.
6. Update everything: the phone’s OS, the companion app, and the accessory or car firmware.

Why does this work? A Bluetooth link depends on both devices agreeing on a stored pairing and a compatible profile (audio, calls, data). Updates on either side can corrupt that pairing. Other things break the link too: battery optimisation stopping a watch or earbud companion app in the background, the phone juggling a watch, earbuds and car at once, interference from Wi-Fi or USB 3 devices, simple distance or your body in the way, a car head unit or earbuds that need new firmware for a new phone or OS, or a bug in the phone’s Bluetooth software that a later update fixes. Occasionally it’s a hardware fault in the wireless chip or antenna.

iPhone: car, CarPlay and earbuds

1. Go to Settings › Bluetooth, tap the ⓘ next to the device and choose Forget This Device. Delete the iPhone from the car’s list too, then pair again.
2. Update iOS in Settings › General › Software Update. The iOS 27 problems and fixes page covers the current release.
3. For CarPlay, open Settings › General › CarPlay, pick your car and tap Forget This Car, then reconnect. Check Siri is on (Settings › Siri) and that CarPlay isn’t blocked in Settings › Screen Time › Content & Privacy Restrictions › Allowed Apps.
4. Wired CarPlay dropping? Try another cable. A worn cable is the top cause.
5. Reset Network Settings: Settings › General › Transfer or Reset iPhone › Reset › Reset Network Settings. It clears all Bluetooth pairings and Wi-Fi passwords, and it often fixes the stubborn cases.

With AirPods, also look at Settings › [AirPods] for automatic ear detection and the “Connect to This iPhone” option, which controls automatic switching between your Apple devices.

Android: Bluetooth and Android Auto

1. Forget and re-pair. Go to Settings › Connected devices (on Samsung, Settings › Connections › Bluetooth), tap the gear next to the device and choose Forget or Unpair.
2. Update Android Auto and Google Play services from the Play Store, and install any system update.
3. Clear old cars from Android Auto. On many phones it’s under Settings › Connected devices › Connection preferences › Android Auto. Remove the saved cars, then reconnect.
4. Turn off battery optimisation for companion apps such as Galaxy Wearable, Pixel Watch or your earbud app: Settings › Apps › [app] › Battery › Unrestricted.
5. Clear the Bluetooth cache where your phone allows it: Settings › Apps › show system apps › Bluetooth › Storage › Clear cache.
6. Reset network settings. On Samsung, Settings › General management › Reset › Reset network settings. On Pixel, Settings › System › Reset options › Reset Bluetooth & Wi-Fi.

On Samsung phones, check that SmartThings auto-connect features aren’t getting in the way. On any phone, swap the USB cable if wired Android Auto keeps dropping.

A smartwatch that keeps losing the phone

Watches depend on a companion app running in the background, so they’re the first thing to break when a phone gets aggressive about saving battery.

On Android, set the watch app (Galaxy Wearable, Google Pixel Watch or your brand’s app) to Unrestricted battery use, keep Bluetooth scanning on in location settings, and don’t swipe it away from recent apps. On iPhone, keep the Apple Watch app updated and make sure Airplane Mode isn’t mirrored to the watch.

Still won’t reconnect? Unpair it from the app, which backs it up, and pair it again.

Stutter, one earbud, no sound: match the symptom

Android users have one more lever. In Developer options you can change the Bluetooth audio codec, and switching from LDAC or aptX to SBC or AAC can steady a shaky connection at the cost of some quality.

Sometimes the update is the bug

Bluetooth complaints follow nearly every big launch:

• iPhone 15. TechRadar reported in February 2024 that owners of all four iPhone 15 models had complained since launch of audio cutting out and frequent disconnects, mostly with older car stereos and headphones. One Apple forum thread had over 1,700 “me too” replies. Restarts and resets reportedly didn’t help; the only reported fix was a replacement from Apple.
• iPhone 16e. heise reported short dropouts and stuttering when streaming to speakers, headsets and AirPods. Some users found that disconnecting one of several connected devices helped, suggesting the phone struggled with multiple connections. iOS 18.4 betas hadn’t fixed it at the time.
• iPhone 17. According to BGR, Apple’s iOS 26.0.1 patched Bluetooth and cellular problems along with CarPlay disconnects.
• Galaxy S26 and Pixel. Tom’s Guide reported in March 2026 that after a Google update, Android Auto would connect and then drop, mostly on wired connections. Neither Google nor Samsung had commented then. Users tried starting Android Auto from the car’s screen, or turning off SmartThings’ Easy Connection features.

If a problem starts right after an update and lots of people report it, the next patch is usually the real fix. Keep the phone, Android Auto and your car or earbud firmware current.

When nothing connects at all

If Bluetooth fails with every accessory after a network reset and an update, or the toggle won’t switch on, the wireless chip or antenna may be faulty. Wi-Fi often misbehaves at the same time. On an iPhone, the hidden iPhone codes guide helps you check the other radio functions. Then, before paying for a repair:

• Run a free All-in-one Basic Info check to confirm the model and warranty.
• For an iPhone, check coverage with an iPhone warranty check, or get a full GSX report for repair and replacement history.
• For a Samsung, a Samsung Info report confirms warranty and region.

Testing Bluetooth on a used phone before you pay

Pair the phone with your own earbuds or your car. Play audio for a few minutes and make a call through it. Check Wi-Fi at the same time, since the two often share hardware. Then verify the IMEI and model, and find out whether it’s still under warranty.