Originally Posted by d123:
“Any network that prohibits tethering on a limited allowance is just making stupid decisions. There is no rational reason to disallow it.”
There is, but it's purely a cynical/greedy one. Namely that if you offer 20GB on the handset only, many people won't easily be able to consume it.
Open it up to tethering and then it will be quite easy to use it up.
I think Three has the right approach with unlimited handset, limited tethering - but should offer more tethering at more affordable prices. If I could pay £15 for AYCE handset data, 4GB of tethering and then pay, say, £1 per GB for more tethering data I wouldn't be too upset as I won't often need more data.
As it stands, you can add 1GB extra for 5GB and then that's it - you hit a brick wall with no option (AFAIK) to buy more.