We're getting the same kind of problem with our new Inseego M2000 device. FMCA sent us one M2000 device and we were getting speeds like 0.50 download and 0.15 upload, which couldn't be right, since that's a high-end $300-$400 device. Then on a few other days we had 0.07 mps (70kb dialup speeds). So Joshua Spurlock from FMCA personally tested another M2000 device and apparently got 200+ mps in his location and shipped that to us. But unfortunately, we got the same slow 0.50 mps speeds. Josh contacted T-Mobile, and apparently, our coverage is "technically" roaming coverage... We aren't in the middle of nowhere either, we live in the middle of a city of 14,000 in Deming NM with a big T-Mobile store right here in town.
I believe this is T-Mobile playing "games", or they are using lat/long rectangles overlaid on the map to "blacklist" hotspots that GPS within the multiple RV park district of the town, or something (give RV'ers the "roaming" speeds - give the rest of the town the normal speeds - I haven't actually tested this theory yet). I find it hard to believe that T-Mobile would have "roaming" coverage over the whole city where they have a prominent T-Mobile store right in town and apparently a tower only 2 miles away from us. So people go to the store to buy new T-Mobile devices, go home and get dialup internet speeds on the T-Mobile network? ... Maybe I'm wrong and everyone in this city has really bad T-Mobile coverage. Personally, I don't think T-Mobile is playing fairly and perhaps FMCA may want to file an FCC complaint if others are experiencing the same problem. Everything worked great for last year and most of 2021 until the last few months.