Hi Mr and Mrs D,
Shhh, don't compliment our looks too much! You're making some of us blush and I can already see some egos growing, haha.
I'm glad to hear that you've switched to TextNow! Our goal is to provide reliable and affordable service, so I think this can definitely work out between us.
To answer your question, you will need to use the TextNow application to make your calls and send your texts, as the native or stock dialers and messaging applications aren't made to work on the VOIP network. The TextNow application converts your calls and messages from the backend number that connects you to the data network and converts it to your correct TextNow number, as well as ensuring you get the best quality of service. :)