Is my iPhone using mobile data?

So, I just recently (2 days ago) switched from a samsung to the new iPhone 6s and I'm wondering if the phone still uses up mobile data while wi-fi is on? I know that with Samsungs, if your mobile data is on and you're connected to wi-fi at the same time, then the phone will just use wi-fi. Is it the same with iPhones? I only have 10 GB of data per month and I need it when I'm out but I've realized I don't get picture messages or group messages unless the mobile data is on. Can I leave it on as long as I'm connected to wi-fi?

Only 10 gb? What do you do on your phone that would cost so much data? Regardless, it will use the Wi-Fi as long as your connected. You won't receive messages (except from iMessage) if your data is off.

Wi-Fi trumps mobile if they're both on. But if the Wi-Fi drops for some reason, you'll be on mobile without knowing it. Dangerous - that's how people end up with bills for thousands of dollars.

Turn off mobile data until you need it. Use it, then turn it off again.

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