01
01Compare
02Checklist
03Guide
Choosing authentication
Trade-offs among Email OTP, TOTP, Push and SMS OTP.
- When must SMS stay?
- Does TOTP have a per-use telecom fee?
- Is Email OTP secure enough?
Resources
Understand the choices before choosing the technology.
Hong Kong-focused notes on SMS, Email, TOTP, WhatsApp, #Sender ID, compliance and measurement. Formal case studies publish only with consent and verified baselines.
Practical checklists — not empty slogans.
02
Question
Options
Advice
Hong Kong SMS and #Sender ID
What registration means and how to prepare application and migration.
03
- SMS
- Other
How to measure outcomes
Record background, classification, routing design, scope, delivery / conversion / fallback and SMS avoided.
04
App and engagement
How owned Push can cut SMS, then connect to platform fallback.
Next step
Start with one real flow: import, consent, approve, measure.
We align current gates and fallbacks first, then land an auditable send path in your workspace. Package pricing is by quotation — contact us.