What I did:
1. Bought jailbroken and unlocked iPhone 2g.
2. Inserted my existing AT&T plan's sim card from my old razr.
3. Called AT&T to get a data package since it wasn't automatically done by AT&T noticing that there was no data plan activated.
4. Ordered iPhone 4 through AT&T and selected the $30 unlimited data plan.
5. Once the new phone came, I activated it through iTunes as a new phone using the new micro-sim and my old number that I've had for a decade.
6. Removed old razr sim from the iPhone 2g.
Now, I've done the same thing so my GF can use the iPhone 2g. Her sim from her old phone now resides in the 2g.
Through all of this, the phone has retained it's jailbreak and unlocked status, as well as all apps(Cydia included).
If I didn't want to load up music on the 2g, I never would've sync'd with iTunes.
1. Bought jailbroken and unlocked iPhone 2g.
2. Inserted my existing AT&T plan's sim card from my old razr.
3. Called AT&T to get a data package since it wasn't automatically done by AT&T noticing that there was no data plan activated.
4. Ordered iPhone 4 through AT&T and selected the $30 unlimited data plan.
5. Once the new phone came, I activated it through iTunes as a new phone using the new micro-sim and my old number that I've had for a decade.
6. Removed old razr sim from the iPhone 2g.
Now, I've done the same thing so my GF can use the iPhone 2g. Her sim from her old phone now resides in the 2g.
Through all of this, the phone has retained it's jailbreak and unlocked status, as well as all apps(Cydia included).
If I didn't want to load up music on the 2g, I never would've sync'd with iTunes.