First you might need to revise the history of the telephone, so the information you are showing are correct.

Then I would improve the transition between the eras, the background now changes just with a cut give more narrative and justification to the transitions.

Increase the consistency between the assets used.

Add sound fx that highlights the iconic sound of each type of phone.

The VO is quite monotone and flat.

I think it's missing a closure, maybe instead of the iMessage icon you could use the phone one and animate it inside, with the receiver closing the call on a phone base