  Penetration of cellphones into markets requires their robust operation in
time-varying radio environments, especially for millimeter-wave communications.
Hands and fingers of a human cause significant changes in the physical
environments of cellphones, which influence the communication qualities to a
large extent. In this paper, electromagnetic models of real hands and cellphone
antennas are developed, and their efficacy is verified through measurements for
the first time in the literature. Referential cellphone antenna arrays at $28$
and $39$~GHz are designed. Their radiation properties are evaluated through
near-field scanning of the two prototypes, first in free space for calibration
of the antenna measurement system and for building simplified models of the
cellphone arrays. Next, radiation measurements are set up with real hands so
that they are compared with electromagnetic simulations of the interaction
between hands and simplified models of the arrays. The comparison showed a
close agreement in terms of spherical coverage, indicating the efficacy of the
hand and antenna array models along with the measurement approach. The
repeatability of the measurements is $0.5$~dB difference in terms of cumulative
distributions of the spherical coverage at the median level.
