I have an iPhone 7 and an iPhone 11 Pro, and can compare them side-by-side.
In areas where iPhone 7 is barely but consistently able to make a data connection (2 bars), iPhone 11 Pro is at 1 bar and unable to do anything.
Back goes the iPhone 11, and I will buy a used iPhone X, being sure to score one with a Qualcomm modem (
i.e. model A1865). Apple is selling some
refurbished iPhones X, but they're nearly the same price as new iPhone 11s