It’s a good thing to admit when you’ve been mistaken, especially if acknowledging the error keeps others from the same misapprehension.
I have always understood Paul’s Roman imprisonment to be IN a Roman prison cell. Either that’s what I’ve been taught, or a conclusion I assumed to be true.
Lately, I’ve heard, in conversation and in my reading, that Paul’s Roman imprisonment for two years, during which he wrote the Prison Epistles, was actually house arrest. So I began to search to find the truth, and I finally have it, to my satisfaction.
This is a picture from an article for which I’ll give you a link so you can read the information for yourself:

https://waynestiles.com/pauls-house-arrest-in-rome-and-our-home-isolation/
Better yet, I found the scripture that states clearly that Paul had rented his own quarters for two years:
Acts 28:30-31.
30 And Paul dwelt two whole years in his own hired house, and received all that came in unto him,
31 Preaching the kingdom of God, and teaching those things which concern the Lord Jesus Christ, with all confidence, no man forbidding him.
Ironic, I think, that Paul paid for the quarters in which he was imprisoned.
Maybe this is not news to you, but somewhere along the way, I missed it. You know how you can read through the Bible, and suddenly a passage pops off the page and hits you right between the eyes, as if you’d never seen it before? Yes? Well, that’s what happened to me with this issue. It certainly explains all the people that could come and go to visit, or to bring food, assistance, etc. And he was not forbidden to preach and teach the gospel while he was imprisoned, making excellent use of his time doing so as well as continuing to pen his epistles.
I hope you’ll take the time to look at the link under the photo above.