OK, I went through the whole process of deleting each provider in turn and then adding them again and I can make calls via all of them fine.
The problem is that when I try to register a provider, it eventually comes back as "failed" and I can bo longer use that provider unless I delete it and re-enter it.
Anyway, I'm not going to worry about registering any provider as Mynetfone is the only one requiring registration for outgoing calls.
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