If you've tried a free texting number on Tinder, Bumble or Hinge and the code never came, you've met VoIP filtering. Here's how it works and how to avoid it.
What "VoIP" means here
Every phone number belongs to a block allocated to a specific provider. Some blocks belong to mobile networks — numbers that live on SIM cards. Others belong to internet telephony services that route calls and texts over the internet. Numbers in the second group are VoIP numbers. Google Voice, TextNow and most second-line apps issue them.
How apps check
When you enter a number, the app (or its SMS provider) can run a carrier lookup. The answer includes the line type: mobile, landline, or VoIP. That takes milliseconds and costs the app almost nothing — so most large apps do it.
Why they block VoIP
- Scale: someone can create hundreds of VoIP numbers in an afternoon. SIM-backed numbers are slower and more expensive to accumulate.
- Bans stick better: banning a mobile number means something; banning a free VoIP number doesn't.
- Fraud signals: spam and romance-scam accounts have historically leaned on VoIP numbers.
What blocking looks like
Apps rarely say "VoIP not allowed". You'll see a generic error, an endless wait for a code, or — later — extra verification on an account that seemed fine.
What passes
| Number type | Typically passes? |
|---|---|
| Your own mobile number | Yes |
| Prepaid SIM | Yes |
| Non-VoIP rented number (SIM-backed) | Usually |
| Google Voice, TextNow, free texting apps | Often not |
| Public "free SMS" website numbers | Rarely, and unsafe |
| Landline | No (can't receive SMS) |
Our numbers come from mobile ranges through our provider. If a particular number still doesn't get a code, it's cancelled at the end of its window and the credit returns to you — you don't pay for numbers that don't work.
常见问题
How do apps know my number is VoIP?
Is a non-VoIP number legal to use?
发布于 2026年10月4日 · 更新于 2026年10月10日 · 我们如何撰写指南
