2026-08-17
GSM-7 vs Unicode SMS in Sri Lanka
Why it matters
GSM-7 (basic English, some symbols) packs more characters into one SMS credit. Sinhala, Tamil, and emoji switch the message to Unicode, which splits earlier and costs more credits.
What to do
Keep OTP codes in English digits. For marketing, write two templates or accept Unicode cost. Test a single message in the portal before a 50,000-row campaign.