HTC One messages

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http://forums.androidcentral.com – Just switched over to HTC One from iPhone and still getting used to a lot of things. So bare with me if I seem like a noob. A Couple things I've noticed: 1. When sending some messages an icon (text bubble with upside down !) shows up next to the text saying it is pending. But the person on the other end received the message and it hasn't gone away. Why does it do this? 2. My mom has and iPad. We previously messaged each other back and forth using her messages app through imessage and my phone. Is there any way I can still do this or is there an app I can get that will allow this? Prefer (HowTos)