My Lumia finally arrived today from NY (eBay purchase) and I messaged the seller to ask him about unlocking it since he offered the service for $35 at the time of purchase but I declined because I felt it was a bit high. He messaged me back instantly saying that it should be ok at the end of the month or first week of May.
Not sure if this is a guess or based on a reliable source of info.
I've also noticed an unlocker or 2 have removed the option now to unlock this phone. Just for fun I submitted a request through Cellunlocker.net to see what they would say (http://www.cellunlocker.net/nokia-unlock.php
They refunded me almost instantly as expected with the following:
Dear Valued Customer,
We regret to inform you we will be refunding your initial order for your At&t Lumia 900 Unlock Code. The Supplier has informed us it will be further delayed and we do not wish to keep you waiting any longer.
We are sincerely sorry for this situation as we normally come through for our customers. It seems the At&t Lumia 900 Unlock Code is not available anywhere globally at this time.
We are contiually working on this, and once we have a working method 100%, we will contact you right away regarding this.
Thanks once again our sincere apologies, and please allow 1-2 business days for your refund to reflect on your account
If you have any other questions or concerns please feel free to call us at 1-800-507-9077 or email us at firstname.lastname@example.org anytime.
- Cellunlocker.net Customer Care Support Team
Have a Wonderful Day!
Obviously this isn't anything new but it sounds like they will at least contact you when the unlock code actually becomes available which is worthy.