There's nothing like entertainment, rather you're the one who is going to be risking your money. And by the way, how did these people even get your number? Unless you registered on their site? If not, then they are likely to be scammers trying to steal your money. I do know sites that does that, some forex trading sites but you will have to register first, they don't just go about calling everyone. If you register on their site and you're not trading, they will start calling you and asking why you don't want to invest and trade with them, questions like that. So it's likely that you must have registered for one of those sites and they are the ones that are calling you to verify from you if you're really interested to trade with them, if not, they will terminate your account.