My boss's wife is an older woman and she keeps receiving spam texts with dirty websites and images. She uses text to keep in touch with friends and family, and blocking numbers does nothing as these spammers typically never use the same number twice. A simple solution would be an option to only receive texts from numbers in your contact list. Technically, it is as if your contact list is a functioning whitelist, throwing texts from unknown numbers into Oblivion. Yet, surprisingly, I am yet to find a decent app that is functional with that option. If you guys would consider adding this seemingly simple option to your excellent app, that would be a tremendous help.