Most of the APP that uses SMS OTP make use of a third-party application-to-person (A2P) provider for sending OTP.
If your mobile number is able to send and receive SMS, both locally and from overseas numbers, we recommend contacting the provider of the APP to flag the OTP issue to their A2P providers so that they can look into it.
If you are unable to receive OTP from
| APP Providers | Feedback to their customer support via |
| DBS | 18001111111 |
| POSB | 18003396666 |
| OCBC | 18003633333 |
| UOB | 1800 222 2121 or customer.service@uobgroup.com |
| Citibank | +6562255225 or singapore.customer.service@citi.com |
| Standard Chartered Bank | 18007477000 |
| SingPass | +6566430555 or customercare@assurity.sg |
| Grab | +6566550005 or support.sg@grab.com |
| Gmail/Google | https://support.google.com/accounts/troubleshooter/4430955?hl=en |
| Go to Facebook > Help Center > Report a Problem. | |
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https://help.wechat.com/cgi-bin/newreadtemplate?t=help_center/feedback_form
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