Viber activates an account with a 6-digit code sent by SMS, read out in a call, or taken from the last four digits of a missed "flash call", which in most regions is the first route Viber tries. When no code comes, switch between Wi-Fi and mobile data and ask for the call. If Viber has blocked further tries, wait 24 hours. If it says "Activation failed", Viber has restricted the number for now.
How Viber activates a new account
Viber asks for the number on the registration screen the first time you open it. Your number is your Viber identity, so one number carries one account, and Viber checks it again whenever you activate on a new primary device.
Viber at a glance
- Virtual numbers
- Depends on the number range
- Code sent by
- SMS · phone call
- Code length
- 6 digits
- Asks for the number again later
- Yes
- One number per account
- Yes
Code by text or call
| What you do | |
|---|---|
| SMS | Type the 6-digit code from the text |
| Activate via call | Answer; the code is read out to you |
| Flash call | Enter the last four digits of the number that called |
Viber offers the call when a text does not arrive or the SMS code is refused.
Activation failing: what to check
| What it means | What to do | |
|---|---|---|
| No code at all | The text did not get through | Switch between Wi-Fi and mobile data; abroad, turn on roaming briefly; or ask for the call |
| "Incorrect code" | A typo, or an older code | Check the digits; for a flash call use the last four of the calling number |
| No more attempts allowed | Viber caps tries to stop spam | Wait 24 hours before trying again |
| "Activation failed" | The number is restricted for now | Contact Viber if you think it is a mistake |
| Number not accepted | Internet-based (VoIP) numbers cannot activate Viber | Use a mobile number |
"Activation failed" is about the number, not about you: Viber saw activity on it that looked like spam. On a temporary number that is a reason to change country rather than to try the same range again.
Viber on a computer or tablet
- Desktop is always a second device. Viber has to be activated on your phone first; then you scan the QR code on the computer with the phone and tap Sync.
- Tablet can be a second device, linked by QR code, or the primary one if you do not use Viber on a phone, activated with a number and a 6-digit SMS code.
- Without a number there is no Viber account: every route above starts from a number that received a code.
That is why searches for Viber without a phone number end at the same place. If you want Viber without handing out your main number, the answer is a second number, not no number. Because Viber asks again on a new primary device, pick one you can keep.
Common questions
Can I use Viber without a phone number?
No. Viber activates on a phone number, and the desktop app links to an account that is already active on a phone. A tablet can be the primary device, but it still activates with a number and an SMS code.
What does "Activation failed" mean on Viber?
Viber has temporarily restricted the number, usually because its systems saw spam-like activity on it. Contact Viber if this is your first sign-up or you think it is a mistake.
How long do I have to wait after too many attempts?
Viber's help says 24 hours. Requesting more codes in the meantime does not shorten it.
What is a Viber flash call?
A call from Viber in which the calling number carries the code. You enter the last four digits of the number that called you.