Bose's Flex (2nd Gen) guidance on calls is about profiles rather than a microphone menu: Bluetooth speakers in this line support the Hands-Free Profile (HFP) but not the Headset Profile (HSP), and many calling apps, including Skype, WhatsApp and Facebook Messenger, use HSP, so calls made in apps without HFP support will not be heard or controlled through the speaker. If your voice is not picked up, use the phone's regular call function or another app, and check Bluetooth connection and volume first.
Differential
Likely causes of “Bose SoundLink Flex (2nd Gen) microphone sounds bad or is not detected”, and how to tell them apart
- 1
A call app using the Headset Profile
What separates it The call rings on the phone but you and the caller cannot use the speaker
How to confirm Try the phone's regular call function or a different calling app
- 2
The speaker is not the active audio route
What separates it Call audio keeps coming from the phone earpiece instead of the speaker
How to confirm Select the Bose speaker as the audio output in the call screen
- 3
Weak Bluetooth link
What separates it Your voice breaks up or drops out completely during calls that started fine
How to confirm Move within about 33 feet of the phone and remove interference
- 4
A stale pairing
What separates it Calls worked through the speaker before but now fail to route to it
How to confirm Clear the speaker's paired-device memory, then pair the phone again from scratch
Before you touch a setting
Record this first — changing settings destroys the evidence
- Which app you use for calls
- Whether music plays through the speaker fine
- How far the phone is from the speaker
Try in this order
0 of 5 completedUse a supported call path
ReversibleMake the call with the phone's standard dialer first. If that works, the speaker is fine and the calling app is the limitation.
Choose the audio route
ReversibleDuring the call select the Bose speaker as the output from the phone's audio menu.
Check the connection
ReversibleThe Bluetooth light should be solid white when connected. Stay within about 33 feet of the phone with nothing thick between them.
Clear the memory
ReversibleHold the Bluetooth button 15 seconds, forget the speaker on the phone, and pair again.
Reset
ReversibleHold Power for 15 seconds with the cable removed, reboot, and test a normal call.
Model-specific
What is true of this model and not of its siblings
- Call audio
- Bluetooth speakers of this line support the Hands-Free Profile but not the Headset Profile, and apps like Skype, WhatsApp and Messenger may use the latter, so their call audio can fail to play or be controlled.
Stop boundary
When this stops being a self-service repair
- !If calls never route to the speaker after a factory reset and a new pairing, request service
- !If callers cannot hear you on any phone or app after a reset, contact Bose about the hardware
Evidence ledger
Sources behind this answer
Power, Bluetooth and Shortcut light patterns including failed battery.
The 15-second Power reset and the Volume + and - factory reset.
Four-hour charge, 12-hour playback, overnight charging.
Temperature, charger amp rating and incompatible chargers.
Wait 30 to 60 minutes at room temperature.
Voice prompt and Power button hold.
Wet charging, quick press to power off, tone when powered.
Pairing steps and the 15-second memory clear.
Volume, range, Windows LE listing, HFP versus HSP.
One active driver and two passive radiators, EQ and interference.
Volume, 30-minute auto-off, power off when idle.
Linking, phone assistant and Spotify shortcut.
Firmware 8.2.16 to 4.3.24 and the SE release notes.
The 2026 voice prompt update.
Bose's Speaker Link checklist that lists the Flex 2nd Gen as compatible.
Exact questions
Common questions
Does the speaker support hands-free calls?+
Bose says it supports the Hands-Free Profile.
Which profile do many apps use?+
The Headset Profile, which it does not support.
Which apps have this issue?+
Skype, WhatsApp and Messenger among others.
Will a firmware update change it?+
An update will not add the unsupported Headset Profile, but it fixes bugs.
Is the phone's dialer supported?+
Yes, the standard phone dialer uses the Hands-Free Profile the speaker supports.
Why is call audio on the phone?+
The route was not switched to the speaker.
Can I tell in advance whether an app will work for calls?+
There is no published list of which apps support the Hands-Free Profile, so the fastest test is trying the phone's own dialer first — if that routes to the speaker fine, the speaker itself is confirmed working and the specific app is the limitation, not the hardware.