What app are you using to connect to the shield?
Did you compile and use the BLE-Shield iPhone app that Dr Kroll provides on the github repo?
You can also try to scan and connect using his BLExplr app (paid)https://itunes.apple.com/gb/app/blexplr ... 18027?mt=8
or the Lightblue app (free)https://itunes.apple.com/gb/app/lightbl ... 28110?mt=8
You will _ not _ see the shield under the iPhone Settings>Bluetooth menu, you must use one of the BLE apps or write your own with CoreBluetooth API.