Does using iphone 3g cause a lot of data?

I have a question about my celular data. I can only use my celular 350mb for 1 month.
does using 3g affect my data faster? Its already 45mb.i've only use it for an hour.
should i turn off my 3g?
i've notice that watching youtube cause a lot of data. But i decide not to watch youtube videos. Should i turn off 3g?

It doesn't depend on how fast your connection is. Data usage is based on what you do while using the internet. You should always turn off mobile data when not in use unless you don't have an option. I only use 3g when i don't have Wi-Fi.

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