Immediately after updating, I noticed my Plantronics Bluetooth headset wasn’t connecting. I would put the headset into “discover” mode (this is typically done by holding down the power button on a given headset for anywhere between five and ten seconds) and would flip Bluetooth to ON (underneath Settings -> General). However, the phone would just stall, and would essentially time out trying to find the headset. One thing I soon noticed is that the little Bluetooth icon that used to be in the top right corner of the phone (next to the battery indicator) had gone missing. Problem.

My first order of business was to do a soft reset by powering the phone down and then back on. I hoped to trip whatever in the software was causing the phone’s internal Bluetooth chip to not activate. That didn’t work. I then did a hard reset (hold down power and home button for ten seconds and continue holding until the Apple logo appears). That didn’t work.

Finally, I stumbled upon a post in a dusty corner of the internet that told me to flick Airplane mode on and off a few times and try again. Well it seems unbelievable, but after flipping Airplane mode on and off once, the Bluetooth icon returned to my dock and I was able to pair easily.