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Thanks, Peter and Phil. Phil, this is a serious guide. A lot of info that is useful to me. Many thanks, your a star!

Thanks, Rob. I did notice the search volumes are the same. And it is true that the searches are very close. With Semantic update this may become even closer as they are the same in reality. It crossed my mind though that there may be a benefit of choosing 'i phone' over 'i-phone' as people are less likely to type in a hyphen rather than not, especially on mobile. Every little helps.