I work 3rd shift and I usually put my phone on silent when I sleep, because it seems people can't get it through their head that I sleep during the day. Is there a app that will allow certain numbers to ring even if the phone is on silent? Sort of like a blacklist/whitelist, only I don't want to block all other numbers, just not have them ring. I still want to see if anyone else called or texts, but if my son's school or mother calls, I want it to ring. Seems like most apps only block calls and texts. Thanks.