# Not unique phoneNumber (Error code 10068)

By default the same contact can be used only by 1 holder in a time range of 30 days.

The contact is defined in this way:

* If `otpType=SMS` the contact = phoneNumber
* If `otpType=EMAIL` the contact = email
* If `otpType=WHATSAPP` the contact = phoneNumber


When the control fails the error with error code `10068` is triggered.
If the error 10068 is triggered you will need to wait for the grace period to enroll a disposable certificate with the same contact to a different holder.

![Lean FAQ unique phoneNumber](/assets/lean-faq-unique-number.640bce79a5db0a40a56130e148b6f748841361b132ccf713d5ed707c9305ad1e.668f048b.png)

The "holder's triplet" is defined by `holder.identificationCountry` + `holder.identificationType` + `holder.identificationCode`. These values are specified in the [`DisposableHolder`](/products/leandisposable/enterprise-documentation/developer-documentation/api-references/data-objects#disposableholder)object.

Common scenarios:

* If the same holder was identified with 2 (or more) different triplets in past xx days, the control of the holder's triplet fails and the check of the firstname and the lastname is activated.