Sending pictures on my iphone?

I was wondering if someone could help. I just bought a new i phone and i'm a bit of an iphone noob. I have all you can eat data roaming and unlimited texts. Is it free for me therefore to send pictures to people?

Added (1). What about if its to another iphone via imessages? (i don't really understand imessage but i'm under the impression its if your connected to the internet and between 2 iphones)

No I have same picture and video messages are not included you get charged about 20-40 pence every picture message u send

Yes, its free, pictures are just text messages. Sending to other countries has a charge as thats intl.
Turn imsg on in your settings, its good to have on even if you have unlimited texting because then others that message you can do so free.

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