Enables sodium:phosphate symporter activity. Involved in response to magnesium ion; response to nutrient levels; and sodium-dependent phosphate transport. Located in apical plasma membrane; brush border membrane; and cytoplasmic vesicle. 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]