American Messaging Service LLC. American Messaging Services LLC 1720 Lakepointe Drive Suite 100 Lewisville TX 75057. American Messaging Critical Messaging System The Registered Agent on file for this company is C T Corporation System and is located at One Corporate Center Hartford CT 06103-3220. American messaging services llc . American Messaging Services LLC 1720 Lakepointe Drive Suite 100 Lewisville TX 75057. American Messaging Services LLC 1720 Lakepointe Drive Suite 100 Lewisville TX 75057. American Messaging is the second largest wireless messaging or critical messaging company in the United States delivering more than 5 million critical messages per day. American Messaging Services LLC is a California Foreign Limited-Liability Company filed On June 2 2006. The companys filing status is listed as Active and its File Number is 0654005. The Registered Agent on file for this company is Corporation Service Company and is located at 222 Jefferson Boulevard Suite 200 Warwi