Can I use T-Mobile 4G repaid data plan on my iPhone 3G (factory unlocked)?

This is the plan http://www.walmart.com/...?tv2=true& They say its 4g though but can I use my iPhone 3g on it? I don't care if its a little slow

No, iphone 3g doesn't have 4g capabilities

You could but don't expect 4G speeds. In this case even 3G speeds probably wouldn't happen cause of T-Mobile's incompatible 3G/iPhone network so expect 2G.

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