I have 4 mobiles with which I pool data.
When I travel, I plug in my phone to my laptop and connect to 4g.
I have an older Huawei E5573 4g modem which has a disconnected sim in it.
I just want another sim, connected to the same data pool, that I can use when I travel.
Is this possible without subscribing to another unrequired plan?
Basically, a duplicate sim of my phone would be perfect...
It's not, unfortuantely. This was something previously provided by Optus (not sure if other telco's still do it) for a cost of $5 a month I think.
Now you'd need to find the cheapest plan that would also data pool and at it to your account if you want to do this.