What is the mobile share plan?

I want to get the iphone 5 but i want unlimited data but what is mobile share plan. Do i get data on my phone or is it just for sharing i just want someone to explain this to me (i have sprint and i want at&t)

The mobile data share plan is dumb. Especially if there's multiple lines. What it is, is where you share so much data with the other lines that are on the account.So, say you have 3 lines on one account, && you have 6gb of data, all 3 lines share 6gb of data. So therefore you each have only 2gb of mobile data. I have verizon, && have to have that mobile data, it really sucks. I would go with unlimited. But it costs more.

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