📶 Telecom · Sequence
Mobile Number Portability
How a subscriber moves their number to another operator: porting code, request through the clearing house, donor approval and cutover.
Drawing diagram…
What this diagram shows
- Subscriber gets a unique porting code by SMS
- The clearing house coordinates donor and recipient operators
- Cutover happens in a night window to limit downtime
Prompt used
Mobile number portability sequence: the subscriber sends PORT to 1900 and receives a unique porting code, visits the new (recipient) operator with the code and ID, the recipient submits a port request to the number portability clearing house, which asks the donor operator to validate (no dues, code valid); the donor approves, the clearing house schedules the cutover at night, updates routing databases, the donor deactivates and the recipient activates the new SIM.
Mermaid code
sequenceDiagram actor S as Subscriber participant D as Donor Operator participant R as Recipient Operator participant CH as Clearing House S->>D: SMS PORT to 1900 D-->>S: Unique porting code S->>R: New SIM with code and ID R->>CH: Port request CH->>D: Validate request D-->>CH: Approved (no dues) CH->>CH: Schedule cutover 02:00 CH->>D: Deactivate at cutover CH->>R: Activate at cutover CH->>CH: Update routing databases R-->>S: New SIM active, same number
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