Which US chip should I buy for my unblocked iPhone 4s to use while in the US?

I regularly travel to the US and Canada for work. I have recently acquired an unblocked iPhone 4s but my carrier does not provide coverage in the US and Canada. I would like to acquire a chip from a carrier with coverage in the US and Canada to use my phone over there. I do not care to have a great telephone plan but I do need full internet access with my iPhone. I have been told that different carriers offer chips for USD 50 with unlimited internet access and some free phone minutes requiring a recharge of USD 10 every 6 months. Any help will be appreciated.

I think you should check at&t or t-mobile for a sim card.

Att or posably tmobile and not shure about canada they are a difrent country from us and have difrent providers

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