How not to pay a data plan with iphone and/or android phones?

Is there a way to buy an unlocked iphone or android phone for AT&T to where I don't have to pay a data plan?

How not to pay a data plan with iphone and/or android phones

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First turn off data by launching Settings, tap "General", tap "Network", flip the "Cellular Data" switch to OFF. Now insert the old data free SIM card into the iPhone and wait a minute or so to get service

The first step is important because it prevents the iPhone from attempting to use data, which can inadvertently sign you up for a data plan with some carriers.AT&T has been known to detect and automatically add data plans to smartphones, whereas T-Mobile is reportedly less likely to do so.