Apple ipod

Need help with text applications for the iPhone?

So I downloaded and am considering the link TextPlus call my number. My iPhone plan is just talk and data on an additional line. N SMS. Need to know if, first of all would make my texts on my iPhone go to this application by the Conversely, if this software has received the texts would include, thirdly, if I can send texts from here with my account number related texts sent, Fourth, if I have my number and relationship to make friends with me through this text application that would be free, and, finally, there is no application to prevent this? That's what Im thinking, but the bottom where it says a connection between your phone number is called standard messaging rates.

whether it is a software application and I can not cost money

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