Help ! N920I with ATT IMEI unable to update!

I bought N920I on ebay, and it is factory unlocked version. When I use the New iphone with att, it is working well, but it seems the signal is not well enough and the GPS (goole map) is not as accurate as Iphone 6 one. So I went to ATT retail store, they told me I should update my IMEI in their system so might solve the signal problem. So I just gave them my NOTE 5 IMEI, but they tried couple times and was unable to update it for me. So I went back home and called ATT customer service , they finally override the system and helped me successfully updated IMEI . I am wondering does it really matter to update IMEI when I switch from IPhone 6 to NOTE 5?

International Galaxy Note 5 N920i on US AT&T - Updates?

Hi,

If I was to pick up an international Note 5 (N920i) for use in the USA on AT&T, how would updates work? The theories I have is that either:

1. The device will never get updates


2. Samsung will release updates directly to the device


3. I will have to use custom ROMs for updates

Given that I will root the device (thus the reason for buying the international model), I'm assuming #3 will be the correct path. However, I understand I could run a modified kernel with the stock ROM to allow that, and there only seems to be one ROM outside of the carrier (AT&T/T-Mobile) threads. Could I use an AT&T carrier ROM?

I'm just trying to understand all my options if I walk down this path.

Thanks in advance.

Samsung Pay at&t + N920i

So I just bought a 920i version from eBay (monoprice store). Brand new unlocked. I am on at&t. Downloaded the Samsung pay apk and after signing into my Samsung account via Samsung Pay. After signing in I am getting this message "You must use your own Samsung Account to use Samsung Pay". Well, it is my own account.
So question: Has anyone got Samsung Pay working on N920I with a US carrier (more specifically at&t). Do you have a solution to this problem? Thanks in advance!