5G issues on AT&T with international version.

[Kayza]

I've got a couple of staff with Samsung Galaxy S21 Ultra phones. We are on AT&T. I can't get 5G working on these phones. I finally was told what the proper APN settings for 5G are supposed to be, but we can't get the settings to stick.

Specifically, I can set up a new APN with all the settings except "mnc 410" (no quotes of course). If I try to set that and save the APN either it just doesn't save or the whole APN disappears. It's just bizarre.

Any ideas?

 

[Chuck Finley69]

re: 5G idsues on AT&T with international version.

I've got a couple of staff with Samsung Galaxy S21 Ultra phones. We are on AT&T. I can't get 5G working on these phones. I finally was told what the proper APN settings for 5G are supposed to be, but we can't get the settings to stick.

Specifically, I can set up a new APN with all the settings except "mnc 410" (no quotes of course). If I try to set that and save the APN either it just doesn't save or the whole APN disappears. It's just bizarre.

Any ideas?

That may simply be AT&T provisioning issue that might not be supported for that specific variant.

 

[BergerKing]

Title says you're trying to use international version phones on AT&T, does this mean they did not originate from AT&T, or? I know AT&T can be particular about phones that didn't originate from AT&T itself on the 5G side, in some cases.

 

[mustang7757]

Why would you use international version in the US ?

 

[fuzzylumpkin]

Why would you use international version in the US ?

Cheap grey market imports lol.

 

[mustang7757]

Cheap grey market imports lol.

Possibly lol

 

[fuzzylumpkin]

But to actually attempt to answer the question. Exynos S21s don't support mmWave 5G, so that is *probably* your problem.

And if it is, there is no way to fix it.

 

[mustang7757]

Definitely try to stick with phones from your region

 

[mustang7757]

Thats one of the reasons why they use 2 different chips

 

[Kayza]

Title says you're trying to use international version phones on AT&T, does this mean they did not originate from AT&T, or? I know AT&T can be particular about phones that didn't originate from AT&T itself on the 5G side, in some cases.

Didn't buy from AT&T - I never do. But, AT&T says it should work.

 

[Kayza]

Why would you use international version in the US ?

I wasn't looking for the international version, but that's what was available at the time - stock was an issue and B&H, which is generally very reliable, had these.

 

[Kayza]

But to actually attempt to answer the question. Exynos S21s don't support mmWave 5G, so that is *probably* your problem.

And if it is, there is no way to fix it.

AT&T is not just mmWave. It doesn't do ANY 5G. As I said, it won't allow me to set up the APN, with no error message.

 

[mustang7757]

I wasn't looking for the international version, but that's what was available at the time - stock was an issue and B&H, which is generally very reliable, had these.

Ahh , there are other sources to purchase besides there like bestbuy, Amazon, Samsung.com , Carrier stores .

 

[fuzzylumpkin]

AT&T is not just mmWave. It doesn't do ANY 5G. As I said, it won't allow me to set up the APN, with no error message.

I'm guessing, but there's likely an APN whitelist that doesn't include your American carrier.

Basically the short answer is: it doesn't work because it's the international version.

I doubt you'll get any better an answer... But if you really want one, try asking at XDA.

 

[Chuck Finley69]

AT&T is not just mmWave. It doesn't do ANY 5G. As I said, it won't allow me to set up the APN, with no error message.

AT&T supports the Factory Unlocked Galaxy S21 Ultra 5G (G998U1) which I don’t believe is your model.

 

[Kayza]

AT&T told me that this would do 5G, though not all bands.

At this point I'm trying to get a return from Samsung, but they are being obnoxious. I'm hoping that B&H will deal with it. At least they have been nice about it, but they need to get back to me.

 

[Kayza]

Ahh , there are other sources to purchase besides there like bestbuy, Amazon, Samsung.com , Carrier stores .

BestBuy had no stock. I avoid Amazon when I can. Also, every time I checked, they were also doing the international version.

 

[Chuck Finley69]

AT&T told me that this would do 5G, though not all bands.

At this point I'm trying to get a return from Samsung, but they are being obnoxious. I'm hoping that B&H will deal with it. At least they have been nice about it, but they need to get back to me.

Unfortunately, I can only trust what’s in writing from all the carriers since that’s what they’ll point to in the end. Here’s the most current supported list but it’s a constantly moving target.

https://forums.androidcentral.com/e...locked-Devices-ATT-Network.pdf&token=-AYzHxOI

 

[mustang7757]

BestBuy had no stock. I avoid Amazon when I can. Also, every time I checked, they were also doing the international version.

See maybe you can sell on ebay or swappa then get the US version