Can a telephone number be reassigned?¶

A telephone number may appear in older records and still be active today.

Evidential caution: that the current user is the same person who used the number in the past.

What this means¶

Providers can reassign numbers after accounts close or services lapse. The waiting period and process vary, and investigators should not assume that a number remains permanently attached to one person.

Reassignment can create misleading links. An old account, message, contact entry or online profile may still display the number after it has moved to a new subscriber.

The new user may receive calls or messages intended for the previous holder. A messaging service may also associate the reassigned number with a newly registered account or create confusion around an older account.

In reports, make the time basis explicit. “The number was allocated to this subscriber on this date” is more accurate than treating the number as a permanent personal identifier.

What to check or do next¶

• Preserve the relevant dates. The key question is not who holds the number now, but who held and used it when the communication occurred.
• Seek allocation history from the provider where lawful and proportionate. Record porting, closure, activation and reassignment dates.
• Compare the number with stable service-specific account IDs, device records, SIM identifiers, profile history and contact patterns.

Evidential limits¶

Do not assume continuity because the same number appears across several records. Equally, do not assume a new subscriber controlled earlier communications.