Sodium-independent anion exchanger which mediates the electroneutral exchange of chloride for bicarbonate ions across the cell membrane (PubMed:15184086, PubMed:34668226). Plays an important role in osteoclast differentiation and function (PubMed:34668226). Regulates bone resorption and calpain-dependent actin cytoskeleton organization in osteoclasts via anion exchange-dependent control of pH (By similarity). Essential for intracellular pH regulation in CD8(+) T- cells upon CD3 stimulation, modulating CD8(+) T-cell responses (By similarity). {ECO:0000250|UniProtKB:P13808, ECO:0000269|PubMed:15184086, ECO:0000269|PubMed:34668226}. This is the function of SLC4A2 (solute carrier family 4 member 2, Ensembl gene identifier ENSG00000164889).