England reached stumps on 222-6 in response to New Zealand's 391 all out, trailing by 169 runs after a frustrating second day for the hosts, bookended by profligacy with the ball and misjudgement with the bat.
Phillips smashed his first century for New Zealand in 133 balls as England took the entire morning session to wrap up the Black Caps' innings, before their reply unravelled in an extended evening session.
- Scorecard: England vs New Zealand, second Test, Oval
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Matt Henry starred with the ball, trapping Root (46) - two shy of his 14,000th Test run - and Brook (24) lbw in the space of three balls in a seismic shift in momentum.
Emilio Gay (53 off 114) had kickstarted England's innings with a second successive Test half-century, only to fall two balls later as New Zealand worked their way through the top order.
A 39-run stand between debutants James Rew and Jordan Cox looked to have seen England through to the close, only for Will O'Rourke to dismiss Rew at the death to leave England six down and in trouble.
More to follow.
England vs New Zealand - results and schedule
All times UK and Ireland, all games live on Sky Sports
- First Test (Lord's) - England won by 115 runs
- Second Test (The Kia Oval) - June 17-21 (11am)
- Third Test (Trent Bridge) - June 25-29 (11am)
Watch the day two of the second Test between England and New Zealand live on Sky Sports Cricket on June 18 from 10am (first ball 11am).
