Travel Technology - AT&T Wireless plan negotiation

Has anyone had any success negotiating lower plan rates with AT&T wireless?

Their competitors now offer unlimited mobile to mobile, texting and data for a lot less. Does anyone know of any good plan deals?

Are you a long-standing customer? Do you have a lot of money tied up with them? I'm talking voice, data, maybe another line or two? If they feel that they may be losing too much by letting you walk, they might renegotiate with you. When I left Sprint after 5+ years (for AT&T) they courted me pretty heavily to not leave them.