T-Mobile, which has spotty coverage in some rural areas.
Verizon and AT&T have the best coverage, last I checked.
I use Mint, and I recently needed a new phone to replace my dying OnePlus 7 Pro, so I bought a Xiaomi Poco F5, which I wasn't crazy about, but I decided to try it out anyway until I realized the signal was dropping in and out at my house, so I had to send it back to Amazonia.
I live pretty far out, but my old phone didn't have much trouble so I ended up with a OnePlus Nord 3, which I probably would have chosen first anyway, if I'd taken a little more time to shop.
I'm paying $240/yr ($20/mo) + taxes & fees for 15GB of data, which they let you pay in quarterly installments. My wife has the $15/mo 5GB plan.
Their customer service app & website are much better than Net 10, which I had before they notified me that they were selling to Verizon, and since I was having trouble with their CS anyway, I figured it might be a good time to make a jump.
I don't work for Mint, and I've only been with them for 3 months, but it's been hassle-free so far.
YMMV ;)

.