To resolve the issue of your iPhone not connecting to your JBL speaker, follow these detailed steps:

1. Restart Your Devices
Begin by restarting both your iPhone and JBL speaker. This can often resolve temporary glitches that may be affecting the connection. To restart your iPhone, hold down the power button until you see the slider, then slide to power off. For the JBL speaker, turn it off and then turn it back on.

2. Enable Bluetooth on Your iPhone
Make sure Bluetooth is enabled on your iPhone. Go to Settings > Bluetooth and toggle it on. Wait a moment and ensure your iPhone is discoverable.

3. Activate Pairing Mode on the JBL Speaker
Turn on your JBL speaker and enter pairing mode. This typically involves holding down the Bluetooth button for about 10 seconds until you hear a sound or see a flashing LED indicator indicating that it's in pairing mode. For certain JBL models, pressing and holding the Volume up and Play buttons for 10 seconds can reset the speaker and help it enter pairing mode - learn more - learn more.

4. Forget Previous Devices
On your iPhone, ensure that any previous connections to the JBL speaker are removed. Go to Settings > Bluetooth, find your JBL speaker in the list, tap the information icon (ℹ️), and select Forget This Device.

5. Reconnect to the JBL Speaker
With Bluetooth still enabled and the JBL speaker in pairing mode, return to the Bluetooth settings on your iPhone. Your JBL speaker should appear in the list of devices. Tap it to initiate the connection.

6. Check for Interference
Ensure there are no other devices nearby that may be interfering with the Bluetooth connection, such as Wi-Fi routers or other Bluetooth devices. Move away from potential sources of interference if necessary.

7. Update Your Devices
Ensure that both your iPhone and the JBL speaker are running the latest firmware and software, respectively. For your iPhone, check for updates under Settings > General > Software Update. For the JBL speaker, visit the JBL support page for instructions on updating.

8. Reset Settings on JBL Speaker
If connection issues persist, perform a factory reset on your JBL speaker. The method can vary by model, but generally, it involves holding down specific buttons (like Volume up and Play) for a certain duration. Refer to your JBL speaker's manual for exact instructions.

9. Contact Support
If you've tried all the above steps and are still having trouble, consider reaching out to JBL customer support for further assistance - learn more.

By following these steps meticulously, you should be able to successfully connect your iPhone to your JBL speaker.