Sometimes it works without the "9" (be sure they dont use the "15" either). Have them try that; however, there is no garantee. The international sms service is unreliable in general.richardrocks said:Has anyone successfully sent or received text messages to and from the U.S./Europe and Argentina??? My friends have tried texting my Claro phone with the +54-9-11 ... to no avail. What's the trick??!