If it's with a different service provider they won't let you do this (maybe you could beg but I don't see how any company would allow this as far as they are concerned they have your £100 now). You could keep the sim for that and use the credit with that sim, but if you have a locked phone it'll not work with a differen't network.
We wouldn't be able to take your credit from the other network I'm afraid! If you contact them though, they might be able to have this refunded to you, given the high amount.
Let us know how it goes. :)
Ryan
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