An iPhone sees that the text is going to another iPhone and automatically sends it as an iMessage instead of a text. What happens if the receiving iPhone has reached it's data limit for the month? Will that iMessage push them into overage charges? This would be bad especially if the receiving iPhone has unlimited texting and only limited data. Will that iMessage just vanish? Some have limits on data that when reached the data just shuts off instead of going into an overage charge. If this is the case, is there a way to shut off iMessage? I can see where some people with an iPhone wouldn't want to receive iMessages. One would be someone who does a lot of texting to other iPhone users and has unlimited texting with very limited data available to them.