1. The IQ quiz does not measure your real IQ. If an IQ test takes less than 10 minutes, it is not a real test. A real IQ test takes between 30 minutes to over an hour.
2. Cramming.
“Cramming (fraud) Cramming is a form of fraud in which small charges are added to a bill by a third party without the subscriber’s consent or disclosure. These may be disguised as a tax, some other common fee or a bogus service, and may be several dollars or even just a few cents”
So if they ask you for your phone number, they almost always want to trick you into a paid-subscription.