Enables sodium:phosphate symporter activity. Acts upstream of or within in utero embryonic development and phosphate ion transport. Located in apical plasma membrane and brush border. Is expressed in several structures, including egg cylinder; genitourinary system; small intestine; and tooth. Human ortholog(s) of this gene implicated in pulmonary alveolar microlithiasis. Orthologous to human SLC34A2 (solute carrier family 34 member 2). [provided by Alliance of Genome Resources, Apr 2022]