This bug was fixed in the package modemmanager - 0.5.2.0-0ubuntu1
--------------- modemmanager (0.5.2.0-0ubuntu1) precise; urgency=low
* New upstream bugfix release (stable release 0.5.2). - hso: disable echo removal (LP: #953294) - gsm: retry sending SMS in PDU mode if text fails and PDU is supported -- Mathieu Trudel-Lapierre <email address hidden> Wed, 14 Mar 2012 12:19:08 -0400
This bug was fixed in the package modemmanager - 0.5.2.0-0ubuntu1
---------------
modemmanager (0.5.2.0-0ubuntu1) precise; urgency=low
* New upstream bugfix release (stable release 0.5.2).
- hso: disable echo removal (LP: #953294)
- gsm: retry sending SMS in PDU mode if text fails and PDU is supported
-- Mathieu Trudel-Lapierre <email address hidden> Wed, 14 Mar 2012 12:19:08 -0400