Sending text from iphone to Andriod?

I have the iphone5, ios7.

I'm not totally sure if the texts I'm sending to one andriod user are going through.

When I send the message, it sends as imessage and never switches to text message.

Does that mean the message did not get send? Is there anyway to fix it?

In iOS 7, iMessage and Messages are in the same app. From what I can tell, if the contact doesn't use iMessage, then the app defaults to the standard Messaging functionality and sends the message over the SMS network instead of through iMessage services.