
Not sure if this is possible/feasible but would be a fantastic differentiator...
What if Exetel offered allocated quota and how you access that quota is irrelevant, e.g. mobile dongle or adsl or tethering or mobile phone etc?
So you get a pooled quota across multiple access devices? Then you just purchase/rent X sim cards, ADSL, phone ect. For things that are wireless you could still count the uploads etc.
Most likely not possible as even the infrastructure owners are not doing this.
Later
Ron