iPhone 3GS sim swap with iPhone 3G? OK?

@biteAnApple I went back to the online store and started the "buy iPhone" process to see if the eligibility date had changed on my number. It seems to be the same as it was (I'm still eligible in March 2010).

I obviously don't have any info beyond what I experienced, but it appears that you can swap the 3G and 3Gs SIMs without any issue at all.

here is my predicament ... One of the 5 lines on my account is eligible for the upgrade but already has a 3g phone on it(i have no idea how, but it does) but my line isn't. I ordered the phone from apple for the one line, but plan on just putting my sim into the 3GS. Will I have problems?

I am trying to do the iPhone swap but with the ORIGINAL iPhone (NON-3G), and ATT has been absolutely useless, with 3 different sales reps telling me three different things. From absolutely possible, to absolutely impossible. I currently have the original phone, and its going month-to-month, ie the 2-yr contract is over. What I want to do is bring my wife to ATT from Verizon on a new 2yr contract, part of a newly created family plan, sign her up with the 3GS, and then swap phones. That way I get the new iPhone 3GS with my number, not tied to new 2yr contract (so I can possibly go to Verizon in the winter if the iPhone moves to their platform), and my wife gets my original iPhone. Can anyone confirm that this works or does not work? Has anyone actually tried this? I really appreciate any help! Thanks, Aaron

You can easily swap "active" iPhone sims, even between different accounts,
with no problem.

I wanted out from a family plan account as I am not with the person anymore.
I got a new 3GS on my own new account, put my 3G sim in it from the other
account and activated it with iTunes no problem.

Allan Sampson wrote:
The SIM card used with an iPhone is activated with the iPhone - the SIM card is "married" to the iPhone's IMEI number.

I'm not sure the above is a true statement. When I sold my 3G phone last Friday without its sim card, the person who bought it, brought along his 3G sim card to an inop IP that he took "swimming" accidently and didn't work anymore. As soon as he put "his" sim card in my phone, he was able to make calls. Also, in Preferences, it show his phone number as the working number.

I haven't spoken with him since he left with my old IP, so I don't know if he later ran into any problems or if he had to "fine" tune the sim card with ATT. I DO know there are no calls being made with/to on my account with it as I checked on ATT.com and the last number was shown as used, was a call I made before I sold it to him.

I might add for clarity that I believe ATT unassociated my old IP with my account as the new 3G S now has my telephone number. In other words, the phone I sold was locked, but not associated with me.

Lawrence Kellogg wrote:
So, am I hosed? I am not happy about getting stuck with a $499 charge to upgrade my 3G phone and don't want to wait until December to get a lower price. Both phones are 3G phones and the older 3G phone is still on the network.

This looks like a simple case of having ATT swap phone numbers on your wife's and your phone. Can they not do that? Seems pretty simple to me as you "own" the 2 numbers as long as you have them.

sphereboy wrote:
…funny how all the wives are getting "downgraded" to the 3G .. LOL

Not to stoke the gender fires, but I suspect the IP is heavily one sided on male use. When I offered my 3G to my wife, she said it was too big for her purse. No way did she want it, so I sold it instead. Now I do know women who have IPs, but from my limited observation, I think they make up a small minority of IP users.