Dephosphorylates Wzc (PubMed:10348860). Required for the extracellular polysaccharide colanic acid synthesis, probably involved in the export of colanic acid from the cell to medium (PubMed:11090276). Involved in protection of cells against contact-dependent growth inhibition (CDI), probably due to the loss of a physical impediment to cell-cell contact. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Glycan metabolism; exopolysaccharide biosynthesis. No phosphorylation of Wzc (PubMed:11090276). Loss of mucoid colony phenotype, greatly increased susceptibility to contact-dependent growth inhibition (CDI) (PubMed:18761695). Belongs to the low molecular weight phosphotyrosine protein phosphatase family.