Is there an app to send and receive (in sms both ways)? All the phone numbers that I text (or texted to me) appear on our family bill. Since there seems to be no way to stop that; I am trying to find a simple sms to sms app..a paid one without ads that is as simple to use as 'regular' texting. I also assume a paid app will bypass the fear of me being a spammer since they will have all my information. Thanks so much!