Three Data SIM cards

[JohnH]

I have just bought two data SIM cards (1Gb PAYG) each. I have searched this site for an answer to a couple of questions I have:
A) can I change SIM cards when in France or do they have to be set up first in the UK?
B) I can use them in France no problems, that I have understood. What happens when I move on to Spain? Will they die or can I still have some use from them?
They only cost £6 each including a dongle. The salesman said they cannot give dongles away as everyone uses a mifi device for mobile broadband.
John

 

[The Wino]

Just came back our 3 sim worked in a tethered phone but wouldnt in the mifi dont know why

 

[sean n maggie]

our 3 sim worked great in the mifi in france, didnt have to set up,,,just turned it on....sorry dont know about spain.......

 

[jollyrodger]

Will work in Spain but will eat your data is what I found should be able to swap to second sim ok.
Why not get a 3gb data sim on ebay last 90 days or 3gb whatever comes first.approx £15.