Well i have a giff gaff card in mine and it works a treat.
I did try to find an open ended card for data but they seem to have gone mate
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Audi S8 2017 Mythos Black
Previous 8's
Audi A8 V8T Sport Exec.
to 2017
A8 3 litre sport till 2016
Short walk on the MB dark side
A8 3 litre sport from 2010 to 2012