NC 700 App Connection - Workaround!
I've discovered a workaround for the connection issues on iOS. It looks like the Bluetooth LE connection for the app does not connect if the regular Bluetooth connection is already active.
1. Force close the "Bose Music" app.
2. Open Bluetooth settings on iOS.
3. Delete any "LE-Bose NC 700 HP" entry.
4. Pair with "Bose NC 700 HP" as usual.
5. Tap the (i) icon on "Bose NC 700 HP" and click "Disconnect".
6. Download and launch the "Bose Radar" (not "Bose Music") app.
7. Go to the "Select your Bose AR product" screen (Menu > Bluetooth Connections).
8. You should see "LE-Bose NC 700 HP" and the signal strength. Rest the phone on the right earcup to maximize the signal strength.
8. Tap "LE-Bose NC 700 HP" and wait for it to connenct. Leave the phone resting on the right earcup throughout the process.
9. If you receive an error, click "Try again" to return to the previous screen. Hold the Power / Bluetooth button for 1 second. A second "LE-Bose NC 700 HP" should appear. Click the second one instead. If the second one has a higher signal strength, it may appear at the top instead. Delete "LE-Bose NC 700 HP" from Bluetooth settings on iOS if it reappears there in-between attempts. Repeat this step until iOS finally asks you to pair with "LE-Bose NC 700 HP".
10. Return to Bluetooth settings on iOS.
11. Tap on "LE-Bose NC 700 HP". It should changed from "Disconnected" to "Connected" and remain in a connected state.
12. Ensure "Bose NC 700 HP" is disconnected.
13. Launch the "Bose Music" app and add the headphones as a new device / reconnect to you previously added device. It may take a few retries, but as long as "LE-Bose NC 700 HP" is connected and "Bose NC 700 HP" is disconnected, the app should connect successfully.