freitasm: You have to contact Vodafone and gave these removed from your account as they are linked to it and any traffic someone else use later will be counted as yours.

freitasm: Good to know. Whatever the method, remove it from your account before handing over to someone else.

freitasm: A few cases of people here saying they had high usage to find out later they had given the modems to someone else and being charged for their usage...