Most services that offer operate on a freemium model:

While many users search for these lists out of curiosity or for companionship, security experts and the Sri Lanka Police warn that these "free" offers are rarely what they seem. Sri Lanka Badu Numbers Free

Avoid Advance Payments: Never send money via EzCash or mCash before meeting or receiving a service. This is the most common scam in Sri Lanka. Most services that offer operate on a freemium