I just sold my 3Gs but have an iPhone 4G on order and won't get it till July 14th. Can you tell me if I move the sim card to a 4 year old AT&T Nokia that I have, if it will mess up my phone plan. It's just a regular cell phone with no data features. The sim card fits but I haven't tried it yet. I'm just trying to figure out a way to get by without disruption of my iphone plan. Thanks