Feeling good about your purchase is fine however arguing with random strangers in the face of facts is irrational. AT&T and verion are leaving 3G as well as other carriers.
The end of 2G/3G networks as we know them | DigiKey Verizon confirm with certainty they are done with 3G /verizon
How long will 3G networks remain in use in the US? - Quora sources confirm the end of 3G
T-Mobile is also looking to bail
Another technology sunset? The 3G sunset may be sooner than you think
There are thousands of articles that say the same thing, this is not a rumor. Bottom line do not buy a 3G based GPS tracker