Bluetooth problems with Mac Mini

Hi

Have a late 2012 Mac Mini 2.5GHz i5. It has never connected with my iPhone 6, Samsung j1 or my Samsung Tab. Also my Orbitsound speakers. It does work with my Bluetooth Mac Keyboard and Mac Trackpad. My Sennheiser PX210BT headphones work but keep dropping out on me. I'm running OS X 10.10.4 - Apple Bluetooth Software Version: 4.3.5f8 15969

When I go to par my iPhone I get the following message: Network is unavailable: Make sure network access is enabled. Which it is.

Any idea's as to why this is going on.

Regards

Lee