Voice and Data is gone after 15.1

Hello Zinsco45, 

Thanks for reaching out to the Apple Support Communities. We understand from your message that you no longer are seeing an option under Settings > Cellular > Cellular Data Options for Voice & Data. We're happy to look into this further with you. 

If you turn on the Data Roaming option, do you then have an option for Voice & Data? Check out this article for more details: About the LTE options on your iPhone.  

All the best.

Strange. I have an iPhone 13 Pro and am on AT&T. For you, are you on one of the 5G plans? When I got my iPhone 13 Pro, it was activated with the eSIM, however I have other settings under Cellular. When you go to Settings>General>About>Carrier, mine reads AT&T 48.0.

What version of iPhone are you using? The ability to make adjustments in the Cellular section of Settings is dependent on your cellular carrier. They carrier file is what sets these options. Make contact with them to see what they say.

I would think that if AT&T shut down their older network it means they had beefed up their back-end to support LTE better. If you get into areas where you are getting poor service, I suggest you report that to AT&T. They used to have an app you could use to report your location and signal issues. I used it years ago, but service in my area now is a lot of 5G and LTE, so I don't have a problem any longer.

My understanding is that AT&T will shut down 3G in February of next year. The problem of not having the option to switch to 3G is not the carrier but is in the iOS 15.1 update. I had the same experience mentioned above and was able to recover the 3G option only after downgrading the iOS back to 15.02.

I’m having this issue too after updating to 15.1 I have AT&T and I have to manually switch over to 4G every day at work in order to have data coverage. I can no longer switch because the toggle is now missing. iPhone 11 Pro Max AT&T.

You can "restore" or downgrade from iOS15.1 to 15.02 using a signed ipsw file now. All other previous iOS versions are not allowed or unsigned. This does resolve the voice and data problem with loss of 3G which is a temporary option if your carrier AT&T or VMNO can not change your plan to 4G(LTE)/5G at this time. My MVNO does not plan to switch until February. My understanding is that the transition (discontinuing 3G, expanding 5G) will come with stronger 4G(LTE) signals so that those of us that have relied on 3G for that reason will continue to have a functional signal.

Nope. I’m not using an iPhone with true 5G like the original poster. This is not a resolution and is definitely an iOS problem. My phone is not a 5G phone. Everybody I know with the same phone I have still have the ability to switch back to 4G. So, how is this a carrier issue?

So this is not a carrier issue that’s going to resolve this like it’s being portrayed in the post above.

I understand the temporary fix but it’s being the resolution above is being represented in the wrong way.

Exactly, this is definitely an iOS issue because I always keep my phone on 4G, however as soon as I upgraded my phone to Apple 15.1 update the top right hand corner of my phone switch from 4G to 5G and I couldn’t switch it back because the option was gone. I called Apple and the technician was not helpful because he was supposed to call me back and failed to do so. I believe it was because he couldn’t fix the issue. I have a 11 Pro Max and I am ****** because having the capability to switch between 4G and LTE was the reason why I purchased this phone.