okay guys i got it all taken care of. what happened was, a while ago i enabled call forwarding to my friends phone, and when i turned it off, it was like half activated on at&t's network, so it would call my phone, then think it was still forwarding, so it would try to connect to my friends voicemail, and get confused and go to the busy signal. the lady at at&t reset my voicemail, and said she still heard the busy signal, then she said she noticed that the network still had call forwarding turned on, and on my phone it was off. so she disabled that, and i restarted my phone, but its tethered so it took like 3 minutes. and its working again. so if any of you have this problem, now you know how to fix it.