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XAA = Unlocked US on the aforementioned link.

Interesting. It seems my theory regarding auto-update to the appropriate carrier firmware is debunked.

I'd try to get it on the Cricket firmware if you're able. I've got an S8, and the HD Voice...

I agree completely! Way too complicated!

If you go factory unlocked, you might be missing out on some of the carrier's features like VoLTE or Wifi Calling. But, you'll have carrier portability...

Generally speaking, what you're saying is true with most network-branded phones.

However, the Samsungs (I believe starting with the S8) can actually flash different carrier firmware onto the...

When you put your Cricket sim back in after unlocking did the splash screen now change to Cricket?

You probably need to reboot the phone anyways.

Alternatively, you can borrow somebody's active AT&T sim to get the updates. Insert the active AT&T sim, turn off the auto-clock set feature, and keep checking for updates in the control panel while...

I think that might be the case that your updates are pushed by AT&T (no security updates either).

Try using the AT&T Device Unlock Portal as a non-AT&T customer. You might be able to network...

You might have to have an active AT&T sim to start the software update process. A Cricket sim operating on the AT&T network might not work. Is your phone network unlocked? When booting does it...