[1] On 25 July 2003, Ofcom introduced the General Conditions of Entitlement which apply to all communications networks and service providers in the UK.
Some mobile phone companies can charge a fee to move the customer's number.
Customer debt is not a valid reason for a service provider to refuse issuing of a PAC.
[2] Since 1 July 2019, customers can request a PAC by text message, rather than having to call their existing network.
The rules for number portability are prescribed by the Telecom Regulatory Authority of India (TRAI)