Older Samsung Phone and Mobile Data

I have an older (not smart) Samsung phone. Model SGH-E250.

The problem is that I sent a text message and tried to get into the Virgin Website (SIM supplier) on my pc and was charged a pound - somehow.

According to the Virgin advisor who I spoke to over the mobile phone, I was charged a £1 because I have mobile data switched on.

He advised switching it off, but his instructions don't seem quite right.

He advised going into settings, finding mobile data, and then switching it off.

I cannot find mobile data in the settings menu.

Please can you tell me how to switch mobile data off, and any disadvantages in so doing.

Thank you

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I have found the phone model: SGH-E250