The England midfielder became City's third signing of the summer on Monday when he put pen to paper on a six-year deal which keeps him at the Etihad Stadium until the end of the 2027/28 season.
The legendary Belgian is one of the Club's greatest ever players and won 12 domestic trophies in his storied 11-year career at the Etihad.
Other notable City No.4s include Mike Doyle, Tommy Booth, Gerard Wiekens and Nedum Onuoha.
“It was a number that was presented to me, and I thought because at Leeds I had 23 which is one of my favourite numbers, I felt like because it's a new start I wanted a different number and to try and build a legacy on that number," said Phillips.
“Hopefully, I can.
It's not the first time Phillips has worn the No.4 shirt.
He said, 'No.4' to Phillips when he came to him.
“I'd scored a few goals the season before, so I thought I was more of a number eight, and he came in and told me straight away that I was a number four.
“He'd seen the future!"