I live just outside the range of my cell service provider's coverage area. I am always missing SMS texts, and get a flood of them when I re-enter the signal area. Is there an app that will allow me to still send/receive sms on my phone using only the wifi in my house? I'm not talking about something like Skype or any other instant message app (IM), but an actual SMS app that will work on my phone, not my computer. Thanks!