Catalyzes the conversion of trehalose 6-phosphate into glucose 1-phosphate and glucose 6-phosphate. alpha,alpha-trehalose 6-phosphate + phosphate = beta-D-glucose 1-phosphate + D-glucose 6-phosphate Optimum pH is 6.3. Optimum temperature is 35 degrees Celsius. Monomer. Belongs to the glycosyl hydrolase 65 family.