Catalyzes the reversible phosphorolysis of sucrose 6(F)-phosphate into alpha-D-glucose 1-phosphate (Glc1P) and D-fructose 6-phosphate. 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. To a lesser extent, can also reversibly act on sucrose in vitro (PubMed:24599311). Is also able to catalyze transglycosylation reactions in vitro (PubMed:26074151). phosphate + sucrose 6(F)-phosphate = alpha-D-glucose 1-phosphate + beta-D-fructose 6-phosphate kcat is 82.6 sec(-1) for the phosphorolysis of sucrose 6(F)-phosphate (at 55 degrees Celsius and pH 6.5). kcat is 66.2 sec(-1) for the phosphorolysis of sucrose (at 55 degrees Celsius and pH 6.5). kcat is 24.2 sec(-1) for the synthetic direction with alpha-D-glucose 1-phosphate and D-fructose 6-phosphate as substrates (at 55 degrees Celsius and pH 6.0). kcat is 14.4 sec(-1) for the synthetic direction with alpha-D-glucose 1-phosphate and D-fructose as substrates (at 55 degrees Celsius and pH 6.0). Optimum pH is 6 and 6.5 for the synthetic and phosphorolytic reaction, respectively. Thermostable. Has a half-life of 60 hours at 60 degrees Celsius. Optimum temperature is 55 degrees Celsius. Monomer. The mutant Ala-134 is a promising new biocatalyst for glycosylation reactions on bulky phenolic acceptors. Belongs to the glycosyl hydrolase 13 family. Sucrose phosphorylase subfamily.