O i see, they are both 3G.
Personally as i say just tether your phone to a tablet.
Then your not paying out twice for data with 2 sims.
A quick google, these tablets are all pretty cheap now.
I would say bucks for money this one from those 2 http://www.pcworld.co.uk/gbuk/computing/...138964-pdt.html
The extra memory, and larger screen are my reasons why, but you could save more money None 3G,but thats if you can tether with your mobile provider.