Electrical conductivity and thermal properties of Li3Fe2(PO4)(3) single crystals have been studied over a wide temperature range. The phase transformation detected at 483 K by DSC is accompanied by an anomaly of the conductivity for crystals oriented along the b-axis. The transition to the high-temperature fast ionic phase is observed at about 588 K for crystals oriented along [101] and [10 (1) over bar] directions. The highest conductivity is observed for measurements perpendicular to the b-axis.