To disconnect Bluetooth from another phone, you must physically access that phone and change its Bluetooth settings, there is no remote disconnect option documented by Apple or Google. The two real methods are turning off Bluetooth on the other phone (which disconnects everything) or unpairing your specific device from it (which removes it permanently).
What you need to know before you disconnect Bluetooth from another phone
The critical truth is that you need the other phone in your hands. That gives you two real methods: turn off Bluetooth entirely on that phone, or unpair your specific device so it no longer appears in that phone's saved list.
Turn off Bluetooth on the other phone (disconnects everything)
On an iPhone or iPad, open Control Center and tap the Bluetooth button. Apple's page applies to iPhone, iPod touch, and iPad. Apple says the icon dims and the device disconnects from any connected accessory. This also works as a temporary disconnect: tapping the Bluetooth control in Control Center disconnects accessories and devices until the next day, without turning Bluetooth off. If you want a full off, go to Settings > Bluetooth and switch Bluetooth off.
Google's page applies to Android devices generally and shows the Bluetooth controls from the top of the screen. Swipe down from the top of the screen, touch and hold Bluetooth, then next to the accessory tap Settings. If needed, tap See all under Saved devices, then tap Disconnect.
Unpair or forget your device on the other phone (removes it permanently)
If you want the other phone to stop recognizing your accessory entirely, unpairing is the way to go. This is also the method to use when you need to remove phone from car Bluetooth, so the car no longer auto-connects to a phone you no longer want linked to it.
On iPhone, open Settings > Bluetooth, tap the Info button next to the device, then tap Forget This Device. Sony's support page documents Forget this Device for iPhone/iPad and says Bluetooth must be turned ON first to show the saved list. Google's page documents disconnecting or renaming a paired device, but it does not say Disconnect removes pairing information.
Unpairing removes the connection from that specific phone. To use the accessory with that phone again later, you will need to go through the pairing process from scratch.
What about resetting Bluetooth settings?
Resetting Bluetooth settings is not a standard or recommended method for simply disconnecting a device. For Android, Google's support documentation does not describe a Bluetooth-settings reset path at all, it only covers managing individual Bluetooth devices.
Frequently Asked Questions
Can I disconnect Bluetooth from another phone remotely?
No. Neither Apple nor Google documents a way to remotely disconnect a Bluetooth accessory from a different phone. You must have physical access to the phone that holds the connection.
Will disconnecting Bluetooth on the other phone affect other devices?
Only if you turn Bluetooth off entirely. That disconnects every accessory connected to that phone. Unpairing a single device, by contrast, only removes that one accessory.
Can I disconnect without turning Bluetooth off?
Yes. On iPhone, tap the Bluetooth control in Control Center to disconnect accessories until the next day without turning Bluetooth off. On either platform, unpairing a specific device also removes it while leaving Bluetooth enabled for everything else.
