The article highlights key regulatory updates for May 2025, focusing on telecom regulations and carrier changes. These updates may impact how businesses communicate with customers, especially when it comes to SMS and voice traffic. The main areas of focus include global trends such as the push for Sender ID registration, which is accelerating across countries like Czech Republic, Ireland, Qatar, Tanzania, and Brazil. In the U.S., the FCC's new STIR/SHAKEN rules expand the definition of "Voice Service Provider," requiring businesses to obtain their own SPC token and STIR/SHAKEN certificate. Additionally, new requirements for phone number purchases are being introduced in Brazil, Ireland, and Belgium, including KYC requirements and approved Regulatory Compliance Bundles. The article provides guidance on what businesses should do now, including auditing phone numbers and Sender IDs, registering early, checking with legal counsel, and using available tools.