Can't activate internet with no Wi-Fi?

I got an IPhone 5s yesterday for my 17th. Basically, I'm with Vodafone and brought a freebee. I have unlimited texts, 150 minutes and 250 MG of internet. I tried using Instagram at school, but it wouldn't load. It says 'subscribe to mobile data' or something. My 4G was on, I just want to use the internet:/

Your carrier may not have service in that area. 250 MG will go quick on instagram if not using Wi-Fi.

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