I've signed up to a JB hifi plan late last year, and found that my Tethering has become a nightmare.
The download / upload speeds are good but I'm getting lots of dropouts since then.
Comparing to Coles Mobile / iPhone 12 Pro, but iPhone 13 Pro on telstra shows terrible results.
Has anyone experienced the same?
Prior to this JB plan, I was on a previous JB plan - had no issues with tethering whatsoever.
Do a like for like comparison with same device in case the 13 Pro is faulty for some reason. Also try wired tethering if you're doing wireless hotspot as there may be interferences causing issues there.
If same result, contact them, it might be a network issue. Coles is on Optus network so maybe Telstra is sketchy in your area for some reason.