Using same account in two phones

Solution 1:

Yes you can and none is kicked out.

I have configured it currently on both of my Android phones. The data is saved on the server, and syncs after some time in cases where you catch a Pokemon on one phone. No data is saved locally except your login info.

I have never tried giving one of the phone to another person and access the game at different location with same google account. That might bring down a Ban situation.

More Info - Reddit

Solution 2:

My son and i use the same account on different phones. we can't both collect pokestops at the same location but he can use it at one location while i use it at another at the same time. anything i catch appears in the caught pokemon on hos phone and vice versa. Same with pokeballs and items collected from pokestops.