I am having the same problem. I don't text that much, and people who have unlimited texting keep sending mass texts and using up the one's I pay for. Apple says there is nothing that can be done about it. I was told at the ATT store that I would be able to pick and choose which texts I wanted to open and delete the rest. Defeats that if the text auto-opens every time I unlock the phone. Is there any app that can stop this?
just get one of the blacklisting apps (on cydia) so u can set it not to recieve texts from some people. Even if u dont open an text it will still count against you. If this person is annoying u ask them to stop. If its realy extream threaten to sue them or actulay report them to the police for making u pay money.