Ah, yes...
...AT&T service.
Back almost 20 years ago, we moved from AT&T to Verizon. AT&T's service was great, if you didn't want to get your voice messages for days on end, or if you really wanted someone to hang up right in the middle of a call. I also found it great that if I wanted to take or make a phone call, I had to walk outside of our house to do so, and even then, it was iffy as to whether I would get the call completed.
At that time, we were also having issues with our AtLink internet service being spotty as well. (Lived just south of the river between Mustang and Tuttle.) We heard about Verizon's MiFi system and went to inquire about it. When I spoke of our issues with phone service, the salesman told us that if the MiFi didn't work because of poor signals, that we could take it back. Long story short, it worked fine, so the next time our phone's contract ended, we went to Verizon. Been with them ever since, including our time in Colorado, Oregon, and Utah. The only times we had issues was if a mountain ridge was between us and the cell towers.
I have 7 lines zero issues.