If you get it on t-mobile from a third party site you'll probably put on web 'n' walk with limits your download speed and the data is only 1gb. Ringing t-mobile and telling them that you have an android phone that requires an always on data connection should see you put on the web 'n' walk plus free of charge which increased the speed 5 fold for me and you get the increased 3gb limit.
Thanks for that. I think I might take the plunge on one of Beepys £20/month offers.