Things we have now that Prime universe Trek did not foresee

[Laura Cynthia Chambers]

At the beginning of First Contact, Picard got up from where he was resting and walked to his deck to answer a important call, he didn't just whip out his phone.

Besides, that way it can't fall out of your pocket, necessitating a million and one answers to the "what's that?" question as posed by the various period drama holo-characters you encounter.