You are talking about tethering. Not allowed under the terms and conditions of your mobile service. Exgract below.
General: Phones subject to availability. From July 2016, your Pay Monthly Standard Contract & Freestyle Airtime Contract will be adjusted every year on your July bill by the Retail Price Index (RPI) rate of inflation announced in the May before. Included in your tariff (subject to the allowance specified): UK calls to UK landlines (beginning 01, 02, 03) & UK mobile networks. Calls and texts to Jersey, Guernsey and Isle of Man mobiles not included. UK texts and data only. You should expect speeds delivered up to 384kbps (3G), actual speeds experienced may be higher or lower and will vary by device and location. You cannot share your data connection with other devices - known as "Tethering" - or use your phone for peer to peer file sharing. Acceptable use policy applies. Calls to 08 (incl. 0870 and 070) numbers not included in monthly allowance (other than those included in the unlimited 08 tariff ) and cost up to 41p and £2.50 a minute respectively in the UK (see our tariffs for details). Pay Monthly service terms apply.
Superuser 2016/17 Use Kudos to say thanks Mark answer as "helpful" only when the problem is solved Please don't send me private messages unless I ask you to. I do not work for VM. The advice I give is based on my best understanding of VM policy and practice. You rely on it at your own risk.