5g and LTE service is poor to none!

@bblack4jc  If you need a primer on cellular boosters (not AT&T's Cell Booster, which is femtocell not a cellular booster), read my Cell Booster Guide, it's the second link in my sig line. As far as 5G goes, I have a 5G capable phone and a 5G plan but in our area 5G is still spotty so I just leave my phone in LTE and all is well.

Thank you for your response. I have read your articles before and it was very informative. I too put my phone on LTE and standard but it doesn’t seem to help. I posted this response and the original post using my wifi which used to be worse than my phone.

Again thank you for your attention to my post.

So WiFi-C (WiFi Calling) doesn't work well for you either for in-home coverage? What kind of phone do you have?

I can get calls as long as it’s not a FaceTime call but they do break up a lot. 
I cannot surf websites or get video calls like FaceTime and other platforms.

My home wifi is DSL and is usually pretty slow. Even if it was fast internet, I don’t think that I should have to use it for my cell phone which I am already paying for it’s service. Why pay AT&T for cell service if I have to use my own internet service? 
I just need a booster that has an outside antenna and an inside signal booster. At least until they can get 5g to work at my location. 
FYI I upgraded my phone just so that it would be 5g compatible. My iPhone 7 worked so much better with Sprint. Of course T-mobile took over. But it makes no difference because it is the 5g and however they broadcast the LTE signals too that is the problem.

Thank you for your response.

I have a iPhone 13 pro

Please do something that will resolve my problem not just put me off again.

Switch service providers. AT&T is clearly not the right provider for you. Try Verizon.   It may be no better, but you do have the option to turn 5G off on your iPhone and just use LTE. Clearly AT&T LTE is not cutting it

@bblack4jc  We had DSL years ago (which was about 20Mbps download) and WiFi-C worked great for us. We moved to a new state and WiFi-C works perfectly on her iPhone 7 and my iPhone 12, and anybody else who comes over with an iPhone that we gave WiFi access to. FaceTime is not an issue nor is MMS/SMS to and from our Android friends.  5G is non-existent in our home and LTE fluctuates a lot so WiFi-C is what we use in-home.

WiFi-C is totally dependent on how robust your WiFi is so if you have a weak signal, you will have issues with WiFi-C.

A cellular booster may work well for you so read my Cellular Booster Guide to get an idea of how they work and what is available to you. If you do go with a cellular booster, I'd suggest getting it professionally installed because installers have the equipment to determine the bandwidths, frequencies, signal strength and propagation that is available to you outside of your home. That is essential for choosing the right type of cellular booster.

@formerlyknownas is correct. You are probably in an AT&T dead area or shadow so shopping around for another provider would be a good idea.

@formerlyknownas I had T-mobile and switched because it had the same poor reception. As I previously said, “But it makes no difference because it is the 5g and however they broadcast the LTE signals too that is the problem.” Going to another company will not resolve the issue. 

@OttoPylot thank you for your response. My DSL is poor. But back to my main point and problem; I should not have to use the internet service that I pay for to service a cell phone that I pay AT&T for. It is not my fault that they switched to 5G and now I get crappy to no service. Yet before 5G I was getting good service.  

The only answer then is to just use LTE Only if that gives you a more reliable signal. You could just be in a shadow or fringe area. Signal strength, type, and propagation is all regulated by the FCC. AT&T, or any provider for that matter, can't just increase signal strength/propagation even if they wanted to, especially if the tower is shared.

I use WiFi-C (WiFi Calling) for our homes because the in-home signal is just not reliable. As soon as we leave the court, the tower signal is fine.No hit that I can see on our data usage as far as the internet connection goes. However, if you have DSL that could be another problem with WiFi-C because certain threshold requirements need to be met reliably for even that to work as needed. The same for the Cell Booster (which is a femtocell not a cellular booster). If you can get at least one to two bars of reliable signal you might have to consider a cellular booster. See my Cellular Booster Guide for a primer, the link is in my sig line.

It is unfortunate that you may have to use another method of connecting to the AT&T Mobility Servers or continue to shop around until you find a provider that offers better cellular coverage for you area. As far as 5G goes, meh. I'd stick to LTE.