Reject an incoming call
<p>I am working on an android that will allow the user to add numbers to a blacklist. When an incoming number matches a number in the blacklist then the call should be rejected, even if the phone does ring briefly and then disconnects the call.</p>

<p>Everything I've found including on SO, says it can't be done without creating AIDL in com.android.internal.telephony which I've created but I can't add the modify phone state permission as it says it needs to be a system app. </p>

<p>I am targetting ICS upwards and I have seen other apps block calls in ICS and up so how is this done. I've also tried adding the modify phone state permission to the manifest file and it displays an error saying that it is only available for system apps so how do I get around this issue. I don't want the app to have to be rooted. </p>

<p>Thanks for any help you can provide</p>
