How can I have two phone numbers on my iPhone?

I have been trying to figure out the best way to have a business phone number as well as my personal number both on my iPhone XR. I have pre-ordered the iPhone 13 Pro and will be upgrading soon. I have been using Google Voice and it has worked okay, but it isn't ideal for a variety of reasons. I understand that there is a Dual Sim and E Sim capability that works with only some providers. I have Xfinity and have read that they do offer this service, was told once by a rep on the phone that they do, and have been told three times by other reps that they do not. The last Xfinity rep I spoke with said that they definitely do not, but AT&T (his former employer) does. He used it with AT&T and said that it was not a good experience. AT&T charges for two phone lines, which ends up being pretty expensive. Two lines at Xfinity would be half the price if they were to offer this capability. I don't want to go through the trouble and expense of switching to AT&T if the two phone lines don't work well. Can anyone speak to their experience with two phone lines with AT&T? Can anyone verify that it is not possible to have two phone lines with Xfinity? Has anyone gone through this process of trying to have two lines on one phone??

I don't need the suggestion to simply have two iPhones as I am aware of that option. I appreciate any and all feedback!