The short answer
Your body absorbs the 2.4GHz signal Bluetooth uses, so a phone in a back pocket with earbuds on the far side is the worst case. Move the phone to a front pocket on the same side, or a bag on that shoulder. Then reduce the codec quality, which trades sound for a far more robust link.
Bluetooth uses very low power in a crowded radio band, and human bodies are mostly water, which absorbs that frequency effectively. That single fact explains most dropouts that happen when walking and not when sitting at a desk.
Fix 1: where the phone is
Move the phone to a front pocket
Rather than a back pocket, so your body is not between it and your head.
Keep it on the same side as the earbud that drops
Most true wireless earbuds designate one bud as the primary that receives from the phone and relays to the other. If the left one drops, the phone is probably on your right.
Try a bag or a jacket pocket
Higher up and closer to head height, which shortens the path and removes your torso from it.
Avoid an armband on the opposite arm
Which sounds convenient and puts your whole body in the way.
Test by holding the phone in your hand
If dropouts stop entirely, position is confirmed and the rest of this article is optional.
Check which earbud is the primary in your model’s documentation. Many let you choose, and switching the primary to the side you carry your phone on eliminates dropouts without changing anything else.
Fix 2: the codec
Higher quality codecs send more data, which needs a better link. In a busy environment they drop packets and the audio cuts out. The basic codec is more robust because it sends less.
On Android, developer options let you select the codec. Forcing the basic one, or a lower bitrate on an adaptive codec, usually eliminates dropouts in crowded places. The sound quality difference is small on earbuds in a noisy street and the reliability difference is large.
Some earbuds also have a connection stability or gaming mode that does the same thing from their own app.
Fix 3: the environment
- Crowds and public transport are the worst case: many bodies plus many phones and earbuds all using the same band.
- Railway stations and airports have dense Wi-Fi as well.
- Shops with security gates and electronic article surveillance systems emit interference.
- City centres generally have a higher noise floor than a quiet street.
Little can be done about these beyond the codec change and phone position, which together make a substantial difference in exactly these environments.
Fix 4: the earbuds themselves
- Reset and re-pair, which clears a degraded connection state.
- Update the firmware, since connection stability is one of the things manufacturers improve most often.
- Charge them fully, because low battery reduces transmit power before any warning appears.
- Clean the charging contacts, since a bud that charges intermittently is also one that behaves oddly.
- Check for a connection priority setting, where some models offer a choice between sound quality and stability.
Fix 5: what else is connected
A phone connected to a watch, a fitness tracker, a car and earbuds simultaneously is sharing one radio between all of them. Disconnecting what you are not using, particularly a watch, frequently resolves dropouts on a walk.
Older phones handle three or more simultaneous connections particularly badly, and this is worth testing even if it seems unlikely.
Be wary of advice to disable Wi-Fi to improve Bluetooth. Modern devices coordinate the two radios well, and turning Wi-Fi off outdoors changes very little while costing you connectivity. The exception is a phone repeatedly scanning for networks, which is worth stopping.
Fix 6: when it is the phone
If the same earbuds are stable with another phone in the same environment, the phone’s Bluetooth implementation or antenna is the weak point. A case with a metal plate for a magnetic mount makes that worse and is worth testing without.
Some phones also apply battery optimisation to the Bluetooth stack, which produces dropouts when the screen is off. Setting the audio app and Bluetooth services to unrestricted battery use resolves that specific pattern.
Why do my earbuds cut out when I walk but not at my desk?
Because your body is between the phone and the earbuds, and human tissue absorbs the 2.4GHz signal Bluetooth uses. A phone in a front pocket on the same side as the primary earbud usually fixes it.
Will a higher quality codec sound better?
Marginally, on earbuds in a noisy environment, and it needs a better link. In crowded places the basic codec is far more reliable and the audible difference is small.
Why is it worse on the train?
Many bodies, many phones, many earbuds and dense Wi-Fi all in one metal box. It is the hardest environment for Bluetooth, and codec choice and phone position help most there.
Does a smartwatch affect earbud connection?
It can, since both share the phone’s Bluetooth radio. Disconnecting the watch as a test is quick and resolves dropouts on some phones.
Should I turn Wi-Fi off to help Bluetooth?
Generally no. Modern devices coordinate the two radios well. The exception is a phone constantly scanning for networks, where disabling scanning rather than Wi-Fi itself is the better change.
The short version
Move the phone to a front pocket on the same side as the primary earbud, which addresses the physics. Force a lower-bandwidth codec for crowded places. Disconnect a watch you are not using. Update the earbud firmware and charge them fully. And if another phone is stable with the same earbuds in the same place, the phone is the weak point.
