
This little tweak allows you to assign a silent ringtone to one or more contacts of your choice.
If someone calls you too often, but you do not want to completely turn off your phone, simply select this ringtone from the default ringtones on your iPhone and that's it.
How to install?
Follow this simple tutorial:
1. First of all make sure you have the source http://cydia.frenchiphone.com added to Cydia. If you haven' yet done so, follow this tutorial.
2. Run Cydia, click "Search" at the bottom of the screen and enter "Silent Ringtone" in the box provided for this purpose.

3. Cliquez dessus, choisissez ensuite "Install" en haut à droite et confirmez sur le prochain écran en cliquant sur "Confirm".

4. Maintenant il vous suffit de choisir "silence" depuis la liste de sonneries depuis la page de détails du contact que vous souhaitez faire taire :-)

It's oh so quiet, ssssssshhhh, sssssshhhh!

