Traditionally, voice offerings, routing, pricing and billing were primarily made based on the phone number prefix. This meant that porting mobile phone numbers from one voice carrier to another did not affect call completion.
Particularly in Europe, this has been changing over the last decade, with significant price differentiation depending on the network that the phone number was ported to and in combination with the geographic zone the call has originated from.
So, as a voice carrier, being able to resolve the mobile number portability issue has likely become critical for your business.
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