You are highly unlikely to need 740W in a 24 port switch to support phones.
A typical phone uses 7W. 7W x 24 ports = 168W.
Maybe a super hungry phone with a video display might use 15.4W. 15.4W x 24 = 370W.
740W / 24 ports = 30W per port. That's like half of an old school incandescent 60W light bulb.
It will be a mistake. You won't need that kind of power.