Is 500MB enough for iPhone 4s?

Looking to get my first contract phone on iPhones 4s on o2. My tariff says 500mb of data. Is that enough to last for a month for internet? I usually use internet almost all the time on Wi-Fi. When I'm at home I use my own Wi-Fi on my own router. When I'm out and about I should use internet on Wi-Fi whilst in hotspots (which is everywhere right?) So Wi-Fi is free? I would mainly use things like facebook, twitter and just googling the odd few things here and there. Also I heard Siri uses data. So is 500mb going to be enough?

Definitely yes, it will be more than enough.

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