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We investigate one of the consequences of the twisted Poincare symmetry. Wederive the charge conservation law and show that the equivalence principle issatisfied in the canonical noncommutative spacetime. We applied the twistedPoincare symmetry to the Weinberg's analysis. To this end, we generalize ourearlier construction of the twisted S matrix \cite{Bu}, which apply thenoncommutativity to the fourier modes, to the massless fields of integer spins.The transformation formula for the twisted S matrix for the massless fields ofinteger spin has been obtained. For massless fields of spin 1, we obtain theconservation of charge, and the universality of coupling constant for masslessfields of spin 2, which can be interpreted as the equality of gravitationalmass and inertial mass, i.e., the equivalence principle.

On Charge Conservation and The Equivalence Principle in the Noncommutative Spacetime