I have an iPhone 3G and I may be upgrading to an iPhone 4 tonight. I'm on AT&T. Once I get up and running on iPhone development, I'm thinking I want to keep the old phone around to test how apps run on the older, slower phone.
After moving to the new phone exactly how does the process with the old phone work? As in, is it now just a phone without a SIM card (so, an iPod Touch essentially)? Do I have to jailbreak it to keep it active? Is there anything else to look out for?
This might be a "duh" question so go ahead and close it if it is.