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A unique 10-digit number associated with a switch that telecom providers use to route voice calls and text messages. The introduction of LRNs was pivotal for number portability, allowing consumers to keep their phone numbers even if they switch to a different service provider or relocate. When a call or message is initiated, the LRN is used to determine the final destination switch and routing path, ensuring that the communication is directed correctly even if the subscriber’s original phone number is associated with a different service provider.

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