  Charged B decays to three charged kaons are analysed in the framework of the
QCD factorization approach. The strong final state K+K-interactions are
described using the kaon scalar and vector form factors. The scalar non-strange
and strange form factors at low K+K- effective masses are constrained by chiral
perturbation theory and satisfy the two-body unitarity conditions. The latter
stem from the properties of the meson-meson amplitudes which describe all
possible S-wave transitions between three coupled channels consisting of two
kaons, two pions and four pions. The vector form factors are fitted to the data
on the electromagnetic kaon interactions. The model results are compared with
the Belle and BaBar data. Away from phi(1020) resonance, in the S-wave
dominated K+K- mass spectra, a possibility for a large CP asymmetry is
identified.
