Not necesserally. Cingular could collect on the estate.
You are only able to get out of contracts through a mutual agreement (ie. both you and Cingular decide you are no longer interested in the contract - which isn't going to happen here), by excersizing a termination clause (ie. paying the ETF), or an act of the courts (ie. you sue Cingular and explain to a judge why the courts should terminate the contract on legal basis - which would make the judge laugh at you in this case).
The only advice you'll find here is to pay the ETF.