How to Pair iPad to iPhone
I have iPad model number ME987B/A version 8.3 iOS 8 and an iPhone 4S.
I can not pair them.
How do I get these two devices to pair?
iOS 8.4, iPad with SIM card option
An iPhone will not pair via Bluetooth to an iPad or to a computer (Mac or Windows) except for personal hotspot and then only if your cellular plan supports it. See the following for more information. https://discussions.apple.com/docs/DOC-7722
If you are attempting to use Handoff/Continuity or AirDrop, that does involve Bluetooth but the devices are NOT paired; Bluetooth just needs to be on and the devices in range of each other. The following may help with Handoff/Continuity issues: https://support.apple.com/en-us/HT204678