MNP - The Problem / Requirement
Mobile Number Portability (MNP / WNP) Routing
Mobile Number Portability (MNP) - aka Wireless Number Portability (WNP) allows cellular phone customers to switch to another network provider without changing their mobile phone number. MNP makes it impossible to tell which network serves a mobile subscriber from just their phone number prefix, causing costly routing failures when SMS and VOIP traffic are sent to the wrong carrier.
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