Unlocked Telus iPhone 4S on T-Mobile or AT&T?

[admin]

I am in the process of getting my Telus 4S unlocked and will be in the US (NY) next week. Any differences between getting a T-Mobile SIM or an AT&T SIM for use while in the US? I noticed that T-Mobile has some very attractive $2 - $3 / day plans for unlimited texting, voice and data which is great...

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