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There's a time and a place for approaching and opening. You need to have common sense dude.
Your four issues are stupid and lack common sense. These are situations where women just wouldn't want to interact with you and when you shouldn't consider it.
For groups of women just open with an opinion opener.
With all respect to your opinion bro...Sorry. I have no sense when it comes to this matter. I try to kill my mathematician common sense and think with my dong instead.
For the phone: I interrupt and ask her to put it off.
For the crowded cafe I have figured it out.
For the sales person i'm still trying to sort it out.
"Common sense" doesn't get you laid and doesn't make you great in life or in any sport or hobby.
Good Luck