on 19-12-2020 21:56
on 19-12-2020 22:15
When you turn on your hotspot it provides a wifi signal for other devices to connect to.
on 19-12-2020 22:18
on 19-12-2020 22:18
Also check the T&C's esp this clause if applicable:
3.5. Usage of Unlimited Data is subject to our Fair Usage Policy. To help us identify whether you are using your Unlimited Data in accordance with the Fair Usage Policy and these Terms , we may monitor the amount of data you are using. Where you regularly tether to 12 or more devices, have used 650GB of data twice within a 6 month period, or have connected to a device other than an eligible device as stipulated in clause 3.3 of these Terms, then we may investigate your usage further to ascertain whether your Unlimited Data usage is for the permitted use. Where following such investigation we determine or reasonably suspect that your usage is for purposes other than the permitted use then we reserve the right to transfer you to a more suitable plan.
https://www.o2.co.uk/termsandconditions/mobile/unlimited-tariff-terms
What device are you using the sim card in?