I also have this problem.
Bought two Boost SIMs for a game/security camera and a gate trigger on my rural property. Need another SIM in the near future for an additional camera.
Neither of these devices use an app and are located 200km from my home. Also, these devices require full sizes SIM cards, which means I now need a converter to put them in my device as my spare phone uses a nano SIM.
Would be happy to add these numbers to my Telstra 24/7 account, but when you try and do that, you get a message saying the numbers are already registered to your profile, but they don't appear so you can check you balance and recharge.
All these problems would be avoided if you could activate, check balance +/- recharge without needing the app, or you could use an existing 24/7 app.
Suspect that when these pre-paids expire, I'll look for another telco with the ability to do this.
