Does sending and receiving picture text messages cost data?

My boyfriend and I both have the iPhone 5s, with unlimited talk and text, but his data plan is much smaller than mine. He's currently away at Camp Lejeune for SOI training for the marines, and he only gets his phone on weekends, but can't connect to Wi-Fi. If I send him pictures, is that using his data? I keep getting mixed answers when I try googling it.

Call your carrier and find out

It might take his data if he has to download the pic from your text messanger. Its best if he asks his cellphone provider.