I have an odd situation... at my in-laws' home, I have AT&T connectivity on my cellphone but my Model S has no connectivity. Here's the map where the Tesla stopped reporting... I went a bit further and I'm staying in Oakland (IL): ...and yet here is what my phone reports (yes, -105 dBm, although it drops to -95 dBm, it's a working signal): Now, this area has long had an issue, up to a few generations of phones ago, I would be told by the phone that I was roaming, even though AT&T's tech support told me I really wasn't. That no longer happens. My SIM is coded for MCC/MNC 310/410, which is AT&T's standard Cingular MNC. The network where I am is showing MCC/MNC 311/190, which is listed as Cellular Properties Inc., aka CellOne East Central IL. That said, they must have an agreement with AT&T because our iPad, iPhone, and Samsung GS3 & GS4 work here without issue. The Tesla, however, doesn't seem to work. AT&T's coverage map shows this as "partner" coverage, presumably the CellOne East Central IL... but given that AT&T doesn't treat it as roaming on the phone, I imagine the Model S shouldn't. Anyone else find spots like this (other than the US/Canada border) where the Tesla didn't/doesn't work but other AT&T devices do? Did Tesla make a change to enable it for you?