I've got a spare T-mobile PAYG phone sim with 5 months 'unlimited' internet, the sim currently has £20 credit. I also have a spare PAYG T-mobile mobile broadband dongle.
What would happen if I try to use the phone sim in the dongle? I seem to remember comments saying that doing this (albeit with O2) works for a period, and then the SIM is blocked.
Is this true with T-Mobile and, if so, what exactly is their objection?