Twilio is a cloud communications platform providing APIs for SMS, voice, video, chat, email, and authentication. Services include Programmable Messaging, Voice, Video, Authy, and SendGrid. Its global telephony network enables developers to build communications features quickly and scale internationally.

Twilio’s core telephony services face significant restrictions in China. SMS and voice delivery to/from Chinese numbers is unreliable due to carrier filtering and telecom regulations; country-specific sender IDs may also be required. Two‑way SMS is disabled, though incoming SMS may reach purchased China numbers. Verification (Twilio Verify) claims support, but delivery rates remain inconsistent. Twilio does not have local data centers or Chinese telecom partnerships, so developers targeting Chinese users should consider local PaaS alternatives (e.g., RongCloud, YunTongXun, YuanYin Cloud), or hybrid fallback flows.

The information regarding service availability in China is provided for general reference purposes only. Due to the dynamic nature of network conditions and regulatory environments, the actual accessibility of these services may vary over time and by location. Users are advised to verify the current status independently.