Enables sodium:phosphate symporter activity. Acts upstream of or within phosphate ion transport. Located in apical plasma membrane and brush border. Is expressed in several structures, including extraembryonic component; genitourinary system; and small intestine. Human ortholog(s) of this gene implicated in hereditary hypophosphatemic rickets with hypercalciuria. Orthologous to human SLC34A3 (solute carrier family 34 member 3). [provided by Alliance of Genome Resources, Apr 2022]