这是公共API所要求的功能。

开发人员的注释暗示了使用sendRawPdu内部SMSDispatcherAPI的，可以通过反射来完成。但是，强烈建议不要将私有API用于生产代码

尚不清楚是否可以使用公共TelephonyManagerAPI 发送。

/*
 * TODO(cleanup): It looks like there is now no useful reason why
 * apps should generate pdus themselves using these routines,
 * instead of handing the raw data to SMSDispatcher (and thereby
 * have the phone process do the encoding).  Moreover, CDMA now
 * has shared state (in the form of the msgId system property)
 * which can only be modified by the phone process, and hence
 * makes the output of these routines incorrect.  Since they now
 * serve no purpose, they should probably just return null
 * directly, and be deprecated.  Going further in that direction,
 * the above parsers of serialized pdu data should probably also
 * be gotten rid of, hiding all but the necessarily visible
 * structured data from client apps.  A possible concern with
 * doing this is that apps may be using these routines to generate
 * pdus that are then sent elsewhere, some network server, for
 * example, and that always returning null would thereby break
 * otherwise useful apps.
 */

/**
 * Get an SMS-SUBMIT PDU for a destination address and a message
 *
 * @param scAddress Service Centre address.  Null means use default.
 * @return a <code>SubmitPdu</code> containing the encoded SC
 *         address, if applicable, and the encoded message.
 *         Returns null on encode error.
 * @hide
 */
public static SubmitPdu getSubmitPdu(String scAddress,
        String destinationAddress, String message,
        boolean statusReportRequested, byte[] header) {

结论：尚不清楚是否可行。我和你有同样的问题。