[android-developers] Write an app to delete messages on the SIM card?

How can I write an app to delete messages from the SIM card? (Since Google in it's wisdom decided to throw out the Messaging app, I now longer have a way to delete SMS messages saved on my SIM card!! I have an alarm system that respond with SMS messages that saves itself to the SIM card and with room for just 20 messages, it quickly becomes full)
As far as I know, the app need to be signed with the same certificate that signed the ROM I am using, is that correct? And if so, is there a way for me to get hold on those certificates?


Regards,

BTJ

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