What could I do with 750MB and or 1GB?

I want to get an iPhone 5 for Christmas but I don't know which contract to get?
I use my phone a lot everyday and would use it a lot if I had an iPhone, for twitter, Facebook, instagram, tumblr and most other apps too. I don't which contract to get either the 750 MB or 1 GB because I'm scared I would go over the amount so which one is best and what could I do with both?!
(both contracts have unlimited texts, just the amount of data and the minutes change)
Thank-you

If you compare the prices, you will find that it cost you less per MB to purchase the 1 GB (or 1000 MB) unit. It is also cheaper than upgrading it later. If you suspect that you will regret not having gotten the 7 GMB later, then pay it now.

Go for 1GB since you use a lot it will better to take more than less.

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