Here is a neutral and interesting summary of the article in one paragraph: Fraudsters are increasingly using phone numbers to scam victims, with toll fraud and SMS traffic pumping being two common types of scams. These scams can result in unexpected charges on Twilio accounts, making it essential for developers to take measures to protect their accounts. To prevent falling victim to these scams, developers can validate phone numbers provided by users before making calls or sending SMS, restrict geographic permissions to specific countries, and use the free Twilio Lookup service to verify phone numbers. The service also offers additional features such as Line Type Intelligence, which provides more information about the type of phone line a number belongs to, allowing developers to make informed decisions about accepting or rejecting phone numbers. Furthermore, using Twilio Verify's Fraud Guard can provide an additional layer of protection against suspected fraudulent numbers. By implementing these measures, developers can significantly reduce their exposure to these scams and protect their Twilio accounts.