I'm looking at getting a 3G PAYG sim for my android tablet and was wondering which one to go for.
I'm with t mobile on contract for my mobile and noticed they do a payg sim which you can get 6 months of data for £20 (500MB per month fair use policy).
Giffgaff have the unlimited data with the £10 per month goody bag, does this have a fair use policy?
Could anyone recommend one of the other networks, not looking for calls or texts just data.
In the case of t mobile, do they inform you when the data is near the end of the 6 month period for topping up? And do you need to top up each month for calls etc. to be eligible for the 6 month deal for data?

The giffgaff one is no use to you unless you can make mobile calls on your tablet (not Skype) as tethering or non mobile phone use is not allowed...I think only the Galaxy tablet meets the requirement.

Yes it can make phone calls, its the commtiva n700.
I like the t mobile option and was wondering if any of the other networks offer similar deals with maybe a larger monthly allowance. Still £20 for 6 months worth of data seems very good!