We present the results of C-13 NMR measurements on A(x)C(60) compounds (A = K, Rb and x = 3, 4, 6). By using high-resolution MAS NMR spectroscopy we were able to identify and characterize the different, thermodynamically stable phases of A(x)C(60). Based on an analysis of the different NMR spectra we discuss the effects of the intercalation on the electronic properties and molecular dynamics in these compounds.