It doesn't mention the use of laptops whatsoever which I find strange, but indicates to me that it's not a problem. Also there is the statement:
Data Bolt On Terms
* The Web Bolt On allows you unlimited use of Telefónica O2 UK Limited's Edge/GPRS/ 3G networks (as applicable to your handset), for personal internet use via your mobile phone. All usage must be for your private, personal and non-commercial purposes. You may not use your SIM Card:
o in, or connected to, any other device including modems;
o to allow the continuous streaming of any audio / video content, enable Voice over Internet (Voip), P2P or file sharing; or
o in such a way that adversely impacts the service to other O2 customers.
If O2 reasonably suspectsyou are not acting in accordance with this policy O2 reserves the right to impose further charges, impose network protection controls which may reduce your speed of transmission, remove the Web Bolt On from your account or disconnect your tariff at any time, having attempted to contact you first.