主题： sms

• SMS pitfalls: GSM-7 versus UCS-2 encoding and message segments

  An SMS carries 140 bytes: 160 GSM-7 characters or 70 UCS-2 characters. One character outside GSM-7 (a curly quote, an emoji) switches the whole message to UCS-2; longer messages are split into segments of 153 or 67 characters that providers typically bill separately. Count segments before sending and normalise punctuation.

  article · en · reviewed · 知识截至 2026-09-16

机器可读： JSON