Method for enjoying a service through a mobile telephone terminal comprising the steps of: A) providing a first mobile telephone terminal with a first subscriber identification card associated to the identity of a first subscriber, said first terminal being adapted to communicate with a first mobile telephone network by means of a long range radio communication transceiver, and said first card being adapted to communicate with other subscriber identification cards by means of a short range radio communication transceiver, said first card allowing the enjoyment of a service, the service provided by said first mobile telephone network, B) providing a second mobile telephone terminal with a second subscriber identification card associated to the identity of a second subscriber, said second terminal being adapted to communicate with a second mobile telephone network by means of a long range radio communication transceiver, and said second card being adapted to communicate with other subscriber identification cards by means of a short range radio communication transceiver, said second card allowing the enjoyment of the service, the service provided by said second mobile telephone network, and said second subscriber having access to the service; C) establishing a short range communication channel between said first card and said second card by means of their short range radio communication transceivers (S1,S2), D) transmitting from said first card to said second card by means of said channel a request to authorise a payment for enjoying the service, said payment to be charged to said second subscriber for the benefit of said first subscriber, wherein said request comprises information specifying the identity of said first subscriber, E) transmitting from said second card to said first card by means of said channel a grant of said payment authorisation request, wherein said grant comprises information specifying the identity of said second subscriber, F) informing said networks (N1, N2) of said granted request to be implemented by said networks (N 1, N2) by: F1) said first terminal requesting said first network by means of its long range radio communication transceiver to be associated to the identity of said second subscriber, and F2) said second terminal requesting said second network by means of its long range radio communication transceiver to be associated to the identity of said first subscriber, and G) enjoying said service through said first terminal based on said granted request. A) providing a first mobile telephone terminal with a first subscriber identification card associated to the identity of a first subscriber, said first terminal being adapted to communicate with a first mobile telephone network by means of a long range radio communication transceiver, and said first card being adapted to communicate with other subscriber identification cards by means of a short range radio communication transceiver, said first card allowing the enjoyment of a service, the service provided by said first mobile telephone network, B) providing a second mobile telephone terminal with a second subscriber identification card associated to the identity of a second subscriber, said second terminal being adapted to communicate with a second mobile telephone network by means of a long range radio communication transceiver, and said second card being adapted to communicate with other subscriber identification cards by means of a short range radio communication transceiver, said second card allowing the enjoyment of the service, the service provided by said second mobile telephone network, and said second subscriber having access to the service; C) establishing a short range communication channel between said first card and said second card by means of their short range radio communication transceivers (S1,S2), D) transmitting from said first card to said second card by means of said channel a request to authorise a payment for enjoying the service, said payment to be charged to said second subscriber for the benefit of said first subscriber, wherein said request comprises information specifying the identity of said first subscriber, E) transmitting from said second card to said first card by means of said channel a grant of said payment authorisation request, wherein said grant comprises information specifying the identity of said second subscriber, F) informing said networks (N1, N2) of said granted request to be implemented by said networks (N 1, N2) by: F1) said first terminal requesting said first network by means of its long range radio communication transceiver to be associated to the identity of said second subscriber, and F2) said second terminal requesting said second network by means of its long range radio communication transceiver to be associated to the identity of said first subscriber, and F1) said first terminal requesting said first network by means of its long range radio communication transceiver to be associated to the identity of said second subscriber, and F2) said second terminal requesting said second network by means of its long range radio communication transceiver to be associated to the identity of said first subscriber, and G) enjoying said service through said first terminal based on said granted request.