How long does a number stay blacklisted?
The clock is ticking for your burned numbers. Autopsy of a telecom prison sentence.
Verdict: The Short Answer
"15 days, 30 days, or change your number."
Score 70-80% (Nuisance): 15 days rest. Score 80-90% (Negative): 30 days. Score 90%+ (Spam/Fraud): the timeline is uncertain, better to change the number.
The Duration Tribunal
Caution (30-70%)
VIGILANCE
Not yet detected as spam, but stay attentive to your practices.
Nuisance (70-80%)
15 DAYS
First flaggings detected. Put the number on pause.
Negative (80-90%)
30 DAYS
Number clearly identified as problematic.
Spam (90%+)
CHANGE
Number burned. The recovery timeline is uncertain.
Why does it take so long?
Database Retention
Databases keep history for months to prevent repeat offenses after a simple pause.
Accumulation
Each new actor that blacklists you adds a layer of difficulty to get out.
Algorithm Memory
AIs memorize your pattern. Even if the number changes, if the pattern stays, the blocking returns.
How to speed up recovery?
What works
- 01. Immediate total quarantine (0 calls).
- 02. Proactive declaration to OS vendors.
- 03. Massive rotation to "fresh" numbers.
What does NOT work
- 01. Simply lowering volume (the algorithm sees everything).
- 02. Harassing the carrier's customer support.
- 03. Waiting without changing your method.
The Detective's Decision Tree
Secure Transition Plan
Backups
Archive the number's history before removing it from rotation.
Proactive Rotation
Don't wait for blocking. Change DIDs every 15 days.
Quarantine
Let the number rest away from all outbound calls.
Auto Monitoring
Use HUHU to know exactly when the number "goes green" again.
Investigation Questions
Can you force the removal of a blacklist?
Should I cancel the number right away?
Why do some numbers come back as "Spam" after 2 days?
Can the number become 100% clean like before?
If I let it rest for a long time, is it guaranteed to work?
Stop wasting your time.
REAL-TIME MONITORING: ORANGE, SFR, GOOGLE, HIYA