I hope someone will respond to my question.
I am urgently trying to get past the AT&T non-support of Update 2 and full Denim support.
I spoke with MS employee who said if the phone were unlocked it would be able to receive OTA update.
I have received unlock code and I have purchased a ConsumerCellular Sim. Can I remove the ATT SIM replace with CC SIM apply the unlock code procedure. Once complete and turned off, can I insert the ATT SIM to properly work or will that phone no longer function on the ATT Network even with an ATT SIM inserted? I want the Update 2 but I do not want to kick myself off of the ATT Network.
Please respond if you have experience or a complete understanding of this situation. I am fearful of proceeding.
Thank you very much...
The procedure you describe can help you to "unlock" the phone. However, unlocking the phone does not remove AT&T branding from the phone. It is still an AT&T 830, though unlocked so that it can run on other GSM carriers. AT&T is still responsible for pushing the hardware updates, because the RM model number of the phone is still tied to them.
The ONLY way you can get the phone to get an update direct from Microsoft is to flash the phone with a Country Variant ROM, which can brick your phone if it isn't done properly.
With the firmware updates that several of the phones have received, I don't even think it is currently possible to flash that particular phone variant (the AT&T variant of the 830) to another ROM. It's locked down and can't be changed.
Unlocking the phone will allow it to be used with another carrier, but AT&T is still responsible for updating it unless you can get it "unbranded." For that, a ROM flash is required.
I hope that helps to explain the difference in a way that you can understand. I didn't want to just tell you, "No, it won't work." I wanted to help you to understand "why" it won't work. "Locking" ties the cellular service to a particular carrier. The ROM variant is what ties the firmware and OS updates to a particular carrier. You can change the ROM while it is still "locked" to a carrier, or you can unlock it while the ROM is still tied to a carrier. The two are not the same, and changing one does not change the other.
Windows 10 will be out soon enough. There are a number of phones that are not planned to upgrade to GDR2 simply because 10 is too close and it would cause 2 upgrades for people. Many people get angry about getting too many upgrades, so carriers try to do them less often. While AT&T has said the 830 would not get the Denim, they did not say it would not upgrade to 10. Let's be patient a bit longer and see where AT&T takes us.