Samsung

Unlocked Samsung Galaxy phones cannot make or receive calls on AT&T

Unlocked Samsung Galaxy phones unable to make or receive calls on AT&T, fix allegedly in the works but no ETA

AT&T is one of the major carriers in the United States. The company is upgrading its network, and one of the steps is shutting down its 3G networks.

The AT&T 3G network shutdown began in February 2022. In theory, this should benefit users, but many experience issues after that.

According to several reportsusers of unlocked Samsung Galaxy phones (and other brands) cannot currently make or receive VoLTE/HD calls on AT&T.

Unlocked Samsung Galaxy phones cannot make or receive calls on AT&T

The shutdown of the AT&T 3G network was done gradually by zone. Thus, over the days, several reports of users affected by the problem have appeared.

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S10 G973U1 BYOD stopped working with 3G network shutdown

My wife’s S10 stopped working when they cut the 3G network in our area. It is listed as a SUPPORTED phone (G973U1) and had been working for almost a year on the AT&T network when it stopped.

I went to the AT&T store and got a new SIM card. When I got the new sim the phone worked for about 10 minutes then again the same problem.
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Galaxy S10 Plus cannot make or receive calls since 2-2-2022

I cannot make or receive calls since 02/22/2022. I noticed no calls on Tuesday, restarted phone, still no calls, checked for updates, none, phone was up to date, reset network settings, no calls.

put in a friends sim card from another carrier, worked fine, put mine back in, 1 successful call using my sim card, then after 10 mins no call, went to the AT&T store, put in a sim card from booted demo phone, inserted my sim card and made a call successfully, 10 mins later no call.
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Reports describe the same pattern after the problem occurred. Affected devices seem to work again when inserting another SIM card, but stop receiving or making calls 10 minutes later.

The possible reason for the problem

It’s worth pointing out that AT&T offers an official list of unlocked or BYOD devices supported by its network. The list also specifies the specific network services supported by each device.

You can check the official list of company network services and compatible devices through this link. But, users report that even devices officially supported by AT&T network services are affected by the issue.

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However, it is possible that the problem is related to the support level of the device in question. For example, one of the affected models is the Galaxy S10 (G973U1).

If you check the G973U1 model in the official AT&T listing, it seems that it only supports HD voice:

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Meanwhile, other models seem compatible with all carrier network services (VoLTE/HD/Wi-Fi Calling):

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So the affected phones could be those that have not yet been properly provisioned to support these functions on the AT&T network, especially since those compatible with all services, i.e. locked units by the operator, do not seem to have similar problems.

Also, phones from other brands besides Samsung (like LG) could be affected, but most reports come from those with Galaxy devices.

Correction apparently in progress

It seems that problems with VoLTE calls are not really new for Samsung Galaxy users on AT&T. There are reports describing similar situations from a few years ago.

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That said, one user reports that AT&T may be working on a patch to fix the problem. However, there is still no official public acknowledgment from the company.

Sad news for you who have AT&T whitelisted unlocked Samsung phones like me. They don’t have an immediate solution to the problem, they are working on it, but it will probably take some time before they fix it. I was lucky to receive a free phone. Many of you will probably have to buy a new one or switch carriers if that’s your preference.
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We’ll update this story as events unfold in the future with any new details.

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