iPhone 16 Bluetooth stops with cellular or connected devices

"iPhone 16 Bluetooth stops with cellular or connected devices: I use iPhone16, and IOS version is 26.2.1. [...]I found a way to make the problem occur: when other devices connect to the phone's Bluetooth or cellular network, the Bluetooth stops working. I think it's because the Bluetooth module and the network module interfere with each other. I took it to the official iPhone store for inspection. The hardware is fine, and reinstalling the phone system on the official website doesn't solve the problem either."

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If iPhone Bluetooth is Having Connectivity Issues:

Try the following in the order provided:

A. Restarting the iPhone:

If any changes were made (i.e. Installed Apps), then Settings (i.e Wf-Fi), may have become manipulated technically. So, try restarting the iPhone:

1. Go To: Settings
2. Tap: General
3. Tap: Shut Down
4. Swipe: Your Finger to the Right

B. Disable Cellular:

Try disabling Cellular, and using Wi-Fi instead, seeing if that makes all the difference.

C. Try manually restarting your iPhone:

1. Go To: Settings
2. Select: General
3. Scroll to: the Very Bottom
4. Select: Shut Down
5. Slide Finger: to the Right
6. Wait: 30 Seconds
7. Power One: the iPhone
8. Try this Once More

D. Reset All Settings to Default:

Nothing would be lost; it's just that selections your made would be set to default (i.e. screen brightness).

1. Go To: Settings
2. Tap: General
3. Tap: Transfer or REset iPhone
4. Tap: General
5. Tap: Transfer or Reset iPhone
6. Tap: Reset All Settings.
7. Swipe: Your finger to the right

As a Last Resort:

E. Restore form a Backup:

Have a backup of your iPhone after this restart that you made, prior to this occurrence? If you are not concerned with losing data, then restore your iPhone from a backup that was made when Wi-Fi was working. Prior to restoring, backup your iPhone, incase anything goes wrong with the restoration.

“Thank you for your response. I have tried restarting, but the problem reoccurs a few days after each restart. Using only Wi-Fi does not meet my usage requirements. I have also tried resetting the network, but the issue still comes back after a few days. Even after the official system recovery, the problem has not been resolved.”

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Report this as a Bug to Apple:

Do your part: Let Apple know what is going on here. Provide them with feedback on this. They may not get back to you directly, but the more feedback they received on this, the more they will know what is going on, and what needs to be fixed in updates to come. These are just user-to-user forums. Apple will nothing of your occurrence, if you don’t report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all started after installing this update. Include the URL of this thread.
4. Proceed from there aw necessary

Exactly what are you trying to connect to and what are you trying to accomplish by connecting?

Are we talking about headphones, speakers, computers, phones, something else entirely?

How about a specific example...

"Thank you."

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You are welcome.

Can you provide some example(s) of what device(s) cannot be connected, as recommended by KiltedKim?