Involved in actively transporting phosphate into cells via Na(+) cotransport in the renal brush border membrane (PubMed:11880379). The cotransport has a Na(+):Pi stoichiometry of 2:1 and is electroneutral (By similarity). 2 Na(+)(out) + phosphate(out) = 2 Na(+)(in) + phosphate(in) Localized at the brush border membrane in the kidney. Highly expressed in the kidney. Not found in any of the other tested tissues. Highest kidney expression is found in weaning rat followed by adult. Lowest expression is found in suckling rat. Belongs to the SLC34A transporter family.