Guides

• How to send OTP SMS in Sri Lanka

  Generate, send, expire, verify — with VeloBotix API.

• How to send bulk SMS in Sri Lanka

  Step-by-step bulk SMS in Sri Lanka: clean list, Sender ID, GSM vs Unicode, schedule, and read delivery reports on VeloBotix.

• Custom Sender ID in Sri Lanka

  Register a brand Sender ID on VeloBotix so OTP and campaigns show your company name instead of a random number.

• GSM-7 vs Unicode SMS

  English SMS uses GSM-7 (more characters per credit). Sinhala, Tamil and emoji use Unicode (fewer characters). Plan copy accordingly.