That route isn't an option. Since pre-'09 didn't come with factory hands free Bluetooth, as many have done, I swapped in a VCIM from an '09+ vehicle to add that functionality. The problem is that the VCIM is also for OnStar, so from the OnStar side they think your vehicle is whatever that VCIM came out of. Generally no big deal. But, apparently there's also another scenario where the ID of that VCIM box is black listed. Maybe it's due to if the original vehicle was a theft recovery, or some other circumstance. But bottom line, the VCIM I have can't be activated for OnStar service, which means no MyGM app for me.
Viper? @Doubeleive
https://www.tahoeyukonforum.com/threads/smartstart-4g-dsm5500-so-much-faster.110449/
I think you need to change alarm to use smart start
Edit.
I know some viper starters have a range of 2 miles.