Neustar previously operated the authoritative directory for U.S. Common Short Codes , part of the short messaging service ( SMS ) relied upon by the U.S. wireless industry .
Neustar previously provides solutions used by mobile network operators to enable mobile instant messaging for their end users .
Neustar previously operated the authoritative directory for U.S. Common Short Codes , part of the short messaging service ( SMS ) relied upon by the U.S. wireless industry , and provides solutions used by mobile network operators to enable mobile instant messaging for their end users .