You get a message in your voicemail informing you that the country’s economy recorded a great surplus at the end of last year - and there is money to be given away as an economic stimulus.
The recipients of the message are encouraged to visit a website where they should register and check for eligibility, in order to get the money. If you get accepted (everybody is) the scammers also require you to pay a “governmental” tax in order to receive the big fat stimulus check.
How to avoid: do not fall for this scam; this is not how official economic stimulus plans are announced – check the daily newspapers.