Consult the Bluetooth product’s user manual or the manufacturer’s website for specific instructions for your device.
Open the Settings menu. Tap Genera. Tap Software Update Tap Download and Install if a new version of iOS is found.
You will need to reconnect your iPhone to your wireless network as well as reconnect all Bluetooth devices, and any VPNs or APNs you are using.
If this doesn’t work, you can hard resetting your iPhone. This will erase all data on your iPhone and restore it to its factory settings. Only do this as a last resort. You may also want to try to see if your iPhone is under warranty so that it can be replaced.
