Why has my network suddenly become unavailable to bluetooth?

why has my network suddenly become unavailable to bluetooth?

I'm not sure that I fully understand 'tethering' other than linking to a 'master'. Nor do I quite know how to answer what I was doing when connecting--I have been trying to connect for some 8 hours now, trying multiple ways around the problem. I guess my main problem is I don't actually understand the technical action underpinning a connection. So I try narrowing down the options and then restoring each action.
I have been trying to work out where the network failure exists--in my laptop or in my iphone. I have gone back through apps, and whether these were connected through iTunes or not.
I haven't tried connecting my phone to a printer or an iPod. I only mention them because my lap top is also failing now to pair with my iPod, and I wondered whether the fault is from my laptop's network connection, rather than my iphone's network connection.
My laptop  wireless connection with my printer has not been disturbed despite the network being unavailable. -- I only mentioned that as an indication that whatever the 'network' was that was unavailable, it was not the network connecting my laptop and printer.
I am grateful for your interest.

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