True, but then he cannot use the SIMlocked phones anymore, and his provider can find out he uses a different phone than the one they gave him a subscription for. If they care to sell different data plans for different models of phones they will also care to check to make sure you don't trick them. Else its kinds pointless... so he needs to play nice with his provider, or take risk that they not check IMEI... or just get a new SIM only with data plan and N900.