iphone 4 on att no contract no data

iPhone 4 on att no contract= no data?
location: macrumors.com - date: November 25, 2010
So here's the thing...I want to use my iPhone 4 on att without a data plan. I have an existing att family plan and I was planning on adding an extra line but just get the sim card with no service agreement. The iPhone that I have is already activated so I don't need to activate it with the new sim. My question is can att still detect that I'm using an iPhone (most likely yes bc of the IMEI) and add the data plan. If they do add it can I just call in and remove it since I'm not obligated to have it since I didnt sign anything? Other notes: -I'm going to bring in a dumb phone when I get the sim card, since they will need to activate the phone -3G and Data will be turned off on the iPhone
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