Is there a way to allow non-mobile numbers (Korean "safe numbers", 050x prefix)?

[jungsikjeong]

Hi, and thanks for this great project — it has been a huge help. 🙏

I am running into an issue when sending SMS to Korean "안심번호" (safe / proxy numbers). These are privacy-protection numbers commonly used here (e.g. on Naver), and they start with a 050 prefix.

When I try to send to one of these numbers, the request is rejected with:

not mobile phone number

From what I can tell, the number is validated with libphonenumber, and a 050x number is classified as VOIP / personal number rather than MOBILE, so it gets filtered out before sending. The thing is, these numbers do receive SMS just fine in practice — they forward to a real mobile phone behind the scenes.

My questions:

1. Is there any way to bypass or disable this number-type validation, so I can send to 050x numbers?
2. Is there a config option or API flag I might have missed for this?
3. If not currently possible, would you consider adding a "skip validation" / "send anyway" option? The device messaging app would ultimately decide whether it can be delivered.

Any guidance would be greatly appreciated. Thanks again! 🙏

[capcom6]

Hello!

Have you tried the skipPhoneValidation query param?

See https://docs.sms-gate.app/faq/general/#can-i-use-long-or-non-standard-phone-numbers