Not sure how that follows. If iPhones last twice as long as Android phones, then for every iPhone sale to one user there are two Android sales to one user. Th

Not sure how that follows. If iPhones last twice as long as Android phones, then for every iPhone sale to one user there are two Android sales to one user. Thus in any given year, there are twice as many iPhone users as the market share of phones sold in that year would indicate.