that's the thing, though...the point of this IS to debate cellular coverage. as in, it doesn't work everywhere...the actual satellite antenna does.
every time someone asks this question, the OP is presented with the usual influx of "just use your phone" when that's often not what they asked. in this case, the OP specifically mentioned that he wanted a portable unit and NOT to use his phone. yet, still, every other response is "just use your phone." not trying to be hard on you specifically, it's just frustrating because i remember going through this before i installed my own XM unit in my model 3. it's harder to help people who want to do the same when they are forced to sift through all the "just use your phone" answers that are a majority of the replies. literally half of the replies on page 1 in a thread where the OP SPECIFICALLY SAID HE DOESN'T WANT TO USE HIS PHONE are replies talking about using your phone. it's maddening.
the number of dead spots when connected via the satellite antenna isn't anywhere near the number of areas across the country where there is no or limited cell service. that's a pretty huge false equivalency.
i know, because i've driven my model 3 from coast to coast twice already, and halfway across the country and back once. there are plenty of areas where i had no streaming, but my satellite radio (via the actual satellite antenna) kept on trucking. far more of the former. not even close.