Does Telkom have any kind of carrier aggregation between their 2300MHz and 1800MHz LTE yet? I know they were talking about it at some Fancourt conference a couple of months, but don't know if it is turned on across the country.
I would presume if one's driving it's going to spend most of its time on the longer range 1800MHz frequencies even if it's passing through a 2300MHz area.
Can't trust the Networks. I've always relied on my cellphone for gps. Still do but even beforehand I make sure on googlemaps on the PC at home, take a pic and memorise where I'm going. Had a situation in Midrand once where the cell maps app got a bit confused.