I think there may be some confusion here. There are three things that might be called 'ph'. There is the English /f/ phoneme, as in 'phone' etc. There is [ɸ], a sound that doesn't occur in English (it sounds like a noiseless whistle). And there is [p
h], which occurs in English but isn't phonemic - that is, no meaning distinction depends on it. "Pin" has it, but "spin" doesn't; don't bother to try to make the distinction (most native speakers aren't aware of it) - try saying those two words while holding a feather in front of your mouth - there's a little puff of air in 'pin' but not in 'spin'.
b
PS That little 'h' should be superscript - printed a bit like an apostrophe. I'm not sure the forum software can handle that. [SUPERSCRIPT]h[/SUPERSCRIPT] - thought not