Today I visited Apple's megastore in Barcelona. I'm travelling so much that I have had real difficulty being in one place long enough to tackle the issue that has affected us all = my 'wifi grey-out' occurred one month after the one year guarantee period expired.
In Melbourne Australia an Apple reseller told me that this is a problem that Apple recognises internally, but the 'business plan' is to get us all to boost the iPhone 5 sales by abandoning our relatively recent defective purchases.
Today I wasted 30 mins at the 'genius' store while not one but two tontos explained to me (in all seriousness) that it was my fault for not taking out additional insurance - I explained that I had purchased mine in a reseller at Singapore Airport, and they did not offer Applecare.
Upshot: a family member has demonstrated to me that all the things that I hold to be precious with Apple products are perfectly feasible with Android. When I pointed this out to the chief tonto in Barcelona his response was 'go buy an android', so I shall. Let's hope it was good advice!
I've tried all the suggestions posted here to no avail alas.