Recent articles provide comprehensive guidance on managing telemarketing calls and avoiding nuisance calls. In France, 12 specific phone number prefixes are identified as originating from telecall centers: 01-62, 01-63, 02-70, 02-71, 03-77, 03-78, 04-24, 04-25, 05-68, 05-69, and 09-48, 09-49. Additional prefixes are used in overseas territories. Since January 2023, telemarketers are prohibited from using mobile numbers starting with 06 and 07, although some still do. To combat unwanted calls, consumers can register on Bloctel, a free government service that blocks calls from registered telemarketers. Apps like Orange Telephone also help identify and block spam calls. Recognizing call identifiers and using blocking services can significantly reduce interruptions. A key tactic to end persistent calls is to ask, 'How did you get my number?', which often disarms telemarketers by exposing their tactics and prompting them to disconnect. Despite regulations, telemarketing calls remain frequent due to persistent scripts and persistent operators. Regulatory authorities have limited call times to weekdays from 10 am to 1 pm and 2 pm to 8 pm, and require telecall centers to use specific number prefixes to help consumers identify commercial calls. Overall, awareness of these prefixes, registration on blocking lists, and strategic responses can help consumers protect themselves from intrusive telemarketing.