Glycerophosphocholine glycerophosphodiesterase responsible for the hydrolysis of intracellular glycerophosphocholine into glycerol-phosphate and choline. The choline is used for phosphatidyl-choline synthesis. Required for utilization of glycerophosphocholine as phosphate source. H2O + sn-glycerol 3-phosphocholine = choline + H(+) + sn-glycerol 3-phosphate Belongs to the GDE1 family.