I have an apple 4OS 8G and I have to turn on my data in order to receive any text. I use my wifi connection at home for my internet, which is working fine without turning on the data, but in order to get text and send text I have to turn on my data and enable 3G. This makes no sense to me and I am being charged for data use as if I keep the data on and go onto the internet it uses the data and not my wifi. How do I fix this. I didn't think I needed data in order to text people?