Catalyzes the reversible phosphorolysis of sucrose 6(F)-phosphate into alpha-D-glucose 1-phosphate (Glc1P) and D-fructose 6-phosphate (PubMed:31405215). May be involved in a new pathway for the degradation of sucrose, which could become phosphorylated on its fructose moiety during uptake via a PTS system (By similarity). Shows strict specificity since it does not catalyze reactions with alternative substrates (PubMed:31405215). phosphate + sucrose 6(F)-phosphate = alpha-D-glucose 1-phosphate + beta-D-fructose 6-phosphate kcat is 126 sec(-1) for the phosphorolysis of sucrose 6(F)-phosphate (at 35 degrees Celsius and pH 7). kcat is 45 sec(-1) for the synthetic direction with alpha-D-glucose 1-phosphate and D-fructose 6-phosphate as substrates (at 35 degrees Celsius and pH 6.5). Optimum pH is 6.5 in the synthesis direction, and more than 50% of the maximum activity is retained within the pH range of 5.5 to 8. In the phosphorolytic direction, the optimum is reached at pH 6. Optimum temperature is 35 degrees Celsius. Monomer. Belongs to the glycosyl hydrolase 13 family. Sucrose phosphorylase subfamily.