For advanced IN solutions there may be no extra conveyance costs. Administration costs are the costs incurred in the porting of an individual number. For all types of costs only the incremental costs should be taken into account. The cost allocation is negotiated between the old and the new service provider, possibly between certain limits derived from national or European Union regulation on interconnection agreements. The costs are borne directly by the customer who is porting the number.
All parties bear their own costs.
In Norway, the date of change from the OR to the IN-related solution is January 2001. In Portugal, a public consultation on the details of number portability implementation was launched in January 2000. If an IN-related solution could not be implemented in Sweden by July 1999, OR was to be used as an interim solution. In Portugal, neither service portability from analogue telephony to ISDN nor location portability within a given geographic numbering area are regulated, but portability is a common practice exercised by the incumbent. Full portability is anticipated in the fourth quarter of 2002.