Making money by selling free simcards

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Something i've been trying out is getting simcards free online, then selling them on. On ebay you can get a bit for them. But since everyone is selling them its difficult to make much(although since they are free then its still profit) But I've found the best way is to sell them on car boot sales, at £1 each. Then you can see an easy profit. If you want some free ones, try here www.simzone.notlong.com