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France halts iPhone 12 sales over radiation levels
(www.bbc.co.uk)
This is a most excellent place for technology news and articles.
They tested on release (it passed), they then re-tested recently (it failed)
I'm far more likely to believe they screwed up the retest than I am that France suddenly found something everyone else missed. Also 4 watts is nothing. I'd maybe start to get a little worried if it was putting out 40 watts, although even that much is still pretty minimal.