Earlier quoted context omitted.
It is. They will collect your personal information, and make it available to their parent (Telefonica, via O2) and one of the other subsidiaries set up specifically to do this, and then re-sell it to the highest bidder. See http://www.fastcompany.com/3002010/telefonica-sell-customer-... for example. If you then subsequently leave them for another network, you will get more SMS spam than you can possibly imagine. http…
Interesting. Thankfully I signed up with one of my disposable gmail accounts. Another problem with giffgaff/O2 is that they compress and artefact every video or large picture one tries to send over their network. They claim its to save you money/bandwidth/data , which is funny as I'm on an unlimited account.
I mentioned before the weirdly broken system they use for this too - 1.2.3.9; 1.2.3.11; etc are all annoying IPs to use.
I too am on an "unlimited" account. Unlimited being the normal definition of "has limits" - they'll insert interstitial warnings about fair use limits and they'll stop flash working.