  Global estimation strategies allow to extract information on a phase or a set
of phases without any prior knowledge, which is, instead, required for local
estimation strategies. We devise a global multiphase protocol based on Holevo's
estimation theory and apply it to the case of digital estimation, i.e. we
estimate the phases in terms of the mutual information between them and the
corresponding estimators. In the single-phase scenario, the protocol
encompasses two specific known optimal strategies. We extend them to the
simultaneous estimation of two phases and evaluate their performance. Then, we
retrieve the ultimate digital bound on precision when a generic number of
phases is simultaneously estimated. We show that in the multiphase strategy
there is only a constant quantum advantage with respect to a sequence of
independent single-phase estimations. This extends a recent similar result,
which settled a controversy on the search for the multiphase enhancement.
