O2 data runs out within a couple hours?

I used to have an iPhone 4S but have now got my mums iPhone 5 as she has now got the iPhone 6 but I have put the SIM card that was in my 4S into the iPhone 5. I'm now on O2, as before I was on Three when I had iPhone 4S. I topped up about £10 but my O2 data seems to run out within a few hours, does anyone know why this is doing it? Is it because I put my sim from my iPhone 4S into iPhone 5?

What should I do?

You probably need a SIM card that is made for the Iphone 5

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