What is the most inexpensive iPhone 4S plan?

I want to get an iPhone 4S but don't know what company. Which company has the most inexpensive plan?

Att&t offers data plans 300mb for $20 or 3gb for $30

O2 orange and 3 are fairly cheap

StraightTalk offers at $45/month and Virgin offers $35/month. Depending on the area of coverage, I would select any one of them.

T-mobile

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