Dual specificity phosphatase; can dephosphorylate both phosphotyrosine and phosphoserine or phosphothreonine residues. Can dephosphorylate glucokinase (in vitro) (By similarity). Has phosphatase activity with the synthetic substrate 6,8-difluoro-4-methylumbelliferyl phosphate and other in vitro substrates (PubMed:10446167, PubMed:24531476). {ECO:0000250|UniProtKB:Q9JIM4, ECO:0000269|PubMed:10446167, ECO:0000269|PubMed:24531476}. This is the function of ENSG00000081721 (DUSP12, dual specificity phosphatase 12).