For CDMA/LTE devices, the MDN and MSISDN may be different. Add a new method getMsisdn() to the Phone interface to return the MSISDN. For GSM/UMTS, this will be the same as getLine1Number(). For CDMA/LTE, getLine1Number() will continue to return the MDN and getMsisdn() will return the MSISDN. Change-Id: Iba0ca24858992b21f63ae7ec0c27d2e90d4b0903