I currently have a Nokia Lumia 521. I've been speaking with my provider (T-Mobile) and he's told me that I can only text with Wi-Fi calling enabled. But here's my question: When I'm at my house, I want to make sure I'm not using my 5GB of data so where / how can I adjust my settings so I can make calls and use the Internet without affecting my data? But if I use Wi-Fi calling only, I can't text? Was my provider also wrong? Appreciate all the help!