Is there a place where you can see wireless connectivity ratings for smartphones?

This is the one piece of information that is often missing from reviews. I have the HTC One now on sprint (I know, I know, but I wanted UNLIMITED !!!!) And sometimes the connectivity map seems to behave like a blanket of swiss cheese.

So is there a site that tests phone connectivity for data for each individual carrier? How does the one compare to the s4 or motorola?

Who puts the best wireless network cards into their phones?