We present a measurement of the B0(s) meson lifetime using
fully and partially reconstructed hadronic decays B0(s) --> D(s)-
pi++(X) followed by D-+_s --> phi pi++-. The data sample was recorded
with the CDF II detector at the Fermilab Tevatron and corresponds to an
integrated luminosity of 1.3 fb-1 from p anti-p collisions at s**(1/2)
= 1.96 TeV.