Phone carriers reassign old numbers to new users. Here's why you're getting someone else's calls and what to do about it.
When you cancel a phone line or port your number to a new carrier, the old number enters a quarantine period (typically 90 days to 1 year) before being reassigned to a new customer. This means the new owner of your old number may receive your calls, texts, and even two-factor authentication codes.
The FCC doesn't mandate a minimum quarantine period, and with the growing demand for phone numbers (especially in popular area codes), carriers sometimes recycle numbers after as little as 30 days.
The North American Numbering Plan has a finite pool of available numbers. With 340+ million active mobile subscriptions in the US and only about 1.6 billion possible 10-digit combinations (accounting for reserved blocks), recycling is necessary. Popular area codes like 212 (Manhattan) and 310 (Los Angeles) have particularly tight number pools.
Carriers pay licensing fees for number blocks and have financial incentives to keep them in active use rather than holding them indefinitely.
Common issues include: receiving calls and texts intended for the previous owner, difficulty setting up accounts that are still linked to the previous owner's email or services, receiving spam calls targeting the previous owner, and authentication problems when services send verification codes to the number expecting the previous owner.
More seriously, a recycled number can enable account takeover — if the previous owner used SMS-based 2FA and didn't update their number on all accounts, the new owner could potentially receive password reset codes.
If you keep getting calls for someone else, answer once and politely explain you're the new owner of this number. For persistent callers, block them individually. Contact the previous owner's bank, doctor, or other callers directly if their information is apparent from the messages you receive.
For accounts still linked to the number, you generally cannot access them (and shouldn't try — that could be illegal). Contact the services directly to inform them the number has been reassigned.
Quarantine periods vary: AT&T typically holds numbers for 90 days, Verizon and T-Mobile hold for approximately 90-180 days. Premium or vanity numbers may be held longer. There's no way to guarantee a specific quarantine period, and carriers can change policies.
Before canceling a phone line, update your number on all accounts — banking, email, social media, and any service using SMS verification. This protects both you and the future owner of the recycled number.
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