I have iphone still on ios 6 and received a text message which says its from myself, by my first and last name which i have in my contacts on the phone. The message had a link to a site, i never clicked the link or anything but since my phone is jailbroken and has this tweak that automatically replies to sms messages when the phone is in Do Not Disturb mode, i think the tweak is called autoresponder, and since my phone was in Do Not Disturb mode when i received that text it replied to it. It replied over imessage and then received the exact same message back.
eg;
Me: hi, sorry i'm not available atm.
Sender: hi, sorry i'm not available atm.
so now it seems like i'm just talking to myself over imessage.
i don't know, anyway just wondering if they could see that and now know that the number is real and will they likely keep sending spam.