> For the complete documentation index, see [llms.txt](https://lynkey.gitbook.io/lynkeysuperapp/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://lynkey.gitbook.io/lynkeysuperapp/product/faqs/english/why-i-cannot-receive-sms-otp.md).

# Why I cannot receive SMS OTP?

In Lynkey's system, it is possible that the mobile network operator may block some number and the company cannot intervene.

**The solution** you can do is to use email/google authentic app for 2FA authentication.

You can contact our supporter to change your 2FA: <support@lynkey.com>