Which Unicode version added the most emoji?โผ
Unicode 7.0, published in June 2014, with around 250 new characters. No release since has matched it. Much of the set came from pre-existing symbol fonts rather than being designed as emoji, which is why it is visually inconsistent.
Why did it take over a year for iPhone to get Unicode 7.0 emoji?โผ
Apple did not ship them until iOS 9.1 in October 2015, around sixteen months after publication. Vendor lag was far longer in this era than it is now, and the size of the release meant a great deal of artwork had to be produced.
Why do some Unicode 7.0 emoji look like plain black symbols?โผ
Characters absorbed from legacy symbol fonts were given text presentation by default. Without a variation selector forcing emoji presentation, some platforms still render them as monochrome glyphs rather than colour emoji.