Keep in mind that this behavior will be a significant outlier in ISP analytics - they will notice you eventually, just like they’ll notice 10 seemingly synchronized Huawei modems connecting to (and disconnecting from) the same base station.
That’s all to say - be careful using this for any nefarious activity. It’s not inconspicuous.
In Australia it's not possible [1] to get SIM cards without identification. So getting on the radar of the security folks at your telco could easily end with you never being able to use that telco again.
That’s all to say - be careful using this for any nefarious activity. It’s not inconspicuous.