Thanks for the info. I actually went Googling and got a better idea of what push notifications were all about. So they ARE tied to the phone, not the SIM?

But remember that you do have the iPhone activated with your SIM, so your buyer may turn so start receiving notifications that were for you.

Even if that's the case, giving the phone to someone else won't be a problem if I haven't setup anything that uses push notifications, right? They can get the phone and setup whatever push notification apps they want, and from then on it will go to that phone, which would be ok.

I think you should make it as you got in the time of purchase. Is it jailbroken? If then erase your personal info.

I have a question then.

What if you are currently a AT&T customer, you purchase an IPhone Apple at a discount due to being allowed an upgrade. Can you, once you receive the phone jailbreak it and use it on say T-Mobile and never get charged anything else by AT&T? The phone would be purchased from Apple, so it wouldn't be activated obviously, yet it would be tied to my account, but only if I was to activate it, it would seem that is the only time I would be charged for the monthly data service.

How does it work when I have to restore my iPhone completely, which is activated correctly with my AT&T sim, when I cancel my contract and switch to T-Mobile?
Will I need to hacktivate my iPhone in that case? Or don't do I need to activate it anymore?

I'm pretty sure that your phone will remain activated. However you need to jailbreak while you still have the active AT&T SIM card inserted.

Next time you restore the phone (to upgrade or whatever) you will need to hacktivate.

If I update my 3GS from 3.0.1 with PwnageTool I probably do not have to activate my iPhone again?
When I have my T-Mobile SIM and something goes wrong and I have to restore completely, I will have to hacktivate loosing push notifications?
Would I be able to activate my phone probably by using a piggyback sim? (Are there already some out?)

Originally Posted by jtk

If I update my 3GS from 3.0.1 with PwnageTool I probably do not have to activate my iPhone again?
When I have my T-Mobile SIM and something goes wrong and I have to restore completely, I will have to hacktivate loosing push notifications?
Would I be able to activate my phone probably by using a piggyback sim? (Are there already some out?)

If you update your phone with pwnagetool you will need to activate your phone again (or tell pwnagetool to hacktivate - thus losing push notifications)

Yes if something goes wrong later and you no longer have AT&T you will have to hacktivate and lose push notifications.

Piggyback sim cards have nothing to do with activation, they are for unlock. As far as I know none of the existing piggyback sims are supported with the newer basebands.

Thank you for this information.
A Piggyback sim (if some will be available) could pretend to be an AT&T sim so I could activate in the right way?

Could I activate my iPhone with a PayAsYouGo SIM correctly and then switch to T-Mobile? Would I still get the right push notifications in this case?