I'm having persistent issues with my iPhone 17 Pro Max when it comes to Bluetooth connectivity. I've been troubleshooting since November, and it's driving me crazy! The phone won't maintain connections to various devices, including my Tesla Model 3 phone key, RENPHO body fat scales, and even Bluetooth water bottles. These devices initially connect, but the connection drops after a while, often needing me to toggle Bluetooth off and on or rename my phone just to reconnect. I've already had Apple replace the phone, yet the same problem persists. Meanwhile, my iPhone 16 Pro Max works flawlessly with all these devices. I've done multiple resets, updated to the latest firmware, and spoken with Apple Support several times but without resolution. Has anyone else faced this issue? Did you find a way to fix it?
2 Answers
It’s possible that your Bluetooth devices are still prioritizing your iPhone 16. Have you unpaired the 16 from your devices and then tested them with the 17? Some devices only connect to the last phone they were paired with. Giving that a shot might help!
No problem! Let me know how that goes.
Have you tried setting your iPhone 17 up as a new device without restoring from a backup? Sometimes an old setting might interfere with the new one. It could be worth checking to see if that resolves the issue. Also, it might help to reset your Bluetooth devices to clear any potential memory conflicts. Just a thought!
Yes, I set both phones up from scratch to avoid any potential interference.

I’ll try turning the 16 off completely and see if that helps. Thanks!