T-Mobile or AT&T FamPlan? ?

Plan that I am looking for:
1400 Minutes
Unlimited Texting
Four lines

There will be 1 smartphone which WILL require a data plan.
If I choose AT&T, MY smartphone will be the iPhone 3GS. The other phones are those regular texting phone and/or others.

If I choose T-Mobile, MY smartphone is undecided, but it will be a smartphone. The other three are regular other phones.

What monthly plan will be the cheapest? Please email me if you need additional info.

Thanks! :D
 
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