If you are facing any difficulties not receiving SMS to verify your contact number, please try these options:
1. Make sure when adding, please use the (+) sign followed by country code and your number with no space. (e.g. +66928543573)
2. Switch on Airplane mode or restart your phone. Afterward please request an OTP to verify the phone number
3. Reinstall your SIM card and request a new OTP
4. Request with a different phone provider to receive a new OTP
Please reach out to the customer support if you are still facing delay receiving OTP after trying all the above options.