@papinist sul sito co.uk di amazon è specificato per le sim h2o - "Hotspot mode / tethering not allowed"
Inoltre sul sito at&t è precisato: "With the exception of the AT&T Unlimited Plus plan, mobile hotspot and tethering is prohibited on AT&T unlimited plans (except for Connected Cars). If you try to set up a mobile hotspot with a device on one of these plans, you’ll receive a notification to contact us or visit our website. If you want to use your device as a mobile hotspot or for tethering, you’ll need to change your plan or move the device to a plan that supports mobile hotspot and tethering." Quindi anche at&t ha ridotto la possibilità di tethering.