Bug 918970 - display existing thread when sending a sms from contact app

But we have a problem here : if I try to get a thread with myself (I put my number in a contact called "me" and send text to myself), all the messages I sent to other contacts would pass this test as well, even if we don't want them in this case. The root of the problem is that we don't have a reliable way to identify our own number. See comment #42 on bugzilla.