Interferes with CBL-mediated down-regulation and degradation of receptor-type tyrosine kinases. Promotes accumulation of activated target receptors, such as T-cell receptors and EGFR, on the cell surface. Exhibits tyrosine phosphatase activity toward several substrates including EGFR, FAK, SYK, and ZAP70. Down-regulates proteins that are dually modified by both protein tyrosine phosphorylation and ubiquitination. H2O + O-phospho-L-tyrosyl-[protein] = L-tyrosyl-[protein] + phosphate Homodimer. Interacts with JAK2 (in vitro) (By similarity). Interacts with CBL (PubMed:15159412). Part of a complex containing CBL and activated EGFR (PubMed:15159412). Interacts with ubiquitin and with mono-ubiquitinated proteins (PubMed:15159412). Interacts with ZAP70 (ubiquitinated form) (PubMed:26903241).