Catalyzes the hydrolysis of aryl-phospho-beta-D-glucosides such as 4-methylumbelliferyl-phospho-beta-D-glucopyranoside (MUG-P), phosphoarbutin and phosphosalicin. Plays a major role in the utilization of arbutin or salicin as the sole carbon source. BglA and BglH are the major proteins contributing to hydrolysis of MUG-P by extracts of late-exponential-phase or stationary-phase B.subtilis cells. 6-phospho-beta-D-glucosyl-(1->4)-D-glucose + H2O = D-glucose + D-glucose 6-phosphate Significantly expressed throughout all stages of growth or development. Highly up-regulated by aryl-beta-D-glucosides such as salicin or 4-methylumbelliferyl-beta-D-glucopyranoside (MUG). Belongs to the glycosyl hydrolase 1 family.