Method for providing, or at least for aiming at providing, a service requiring data connectivity between at least two user terminals (100, 500), the method comprising: a determining procedure comprising determining, by a network node hosting a policy and charging rules function, said network node being hereinafter referred to as "first PCRF", that there is no available data quota associated with one of the at least two user terminals, said user terminal being hereinafter referred to as "first user terminal", for the data connectivity required for the service to be provided; a first notifying procedure comprising notifying, by the first PCRF, a network node hosting an application function, said network node being hereinafter referred to as "AF", about the determination; a second notifying procedure comprising notifying, by the AF, an application service provider, about the determination; and a requesting procedure comprising requesting, by the application service provider, to another one of the at least two user terminals, said other user terminal being hereinafter referred to as "second user terminal", to sponsor the data connectivity of the first user terminal so as to permit the data connectivity required for the service to be provided; the method further comprising: indicating, by the second user terminal, to the application service provider, that the second user terminal agrees to sponsor the data connectivity of the first user terminal so as to permit the data connectivity required for the service to be provided; sending, by the application service provider, to the AF, a message, hereinafter referred to as "first sponsoring message", comprising: an identifier of the second user terminal sponsoring the data connectivity of the first user terminal; and an identifier of the service to which the sponsoring relates; sending, by the AF, to a network node hosting another policy and charging rules function, said network node being hereinafter referred to as "second PCRF", another message, hereinafter referred to as "second sponsoring message", comprising an identifier of the service to which the sponsoring relates; sending, by the second PCRF to the AF, another message, hereinafter referred to as "third sponsoring message", comprising the sponsored data amount; and sending, by the AF, to the first PCRF, another message, hereinafter referred to as "fourth sponsoring message", comprising: an identifier of the second user terminal sponsoring the data connectivity of the first user terminal; an identifier of the service to which the sponsoring relates; and the sponsored data amount. a determining procedure comprising determining, by a network node hosting a policy and charging rules function, said network node being hereinafter referred to as "first PCRF", that there is no available data quota associated with one of the at least two user terminals, said user terminal being hereinafter referred to as "first user terminal", for the data connectivity required for the service to be provided; a first notifying procedure comprising notifying, by the first PCRF, a network node hosting an application function, said network node being hereinafter referred to as "AF", about the determination; a second notifying procedure comprising notifying, by the AF, an application service provider, about the determination; and a requesting procedure comprising requesting, by the application service provider, to another one of the at least two user terminals, said other user terminal being hereinafter referred to as "second user terminal", to sponsor the data connectivity of the first user terminal so as to permit the data connectivity required for the service to be provided; indicating, by the second user terminal, to the application service provider, that the second user terminal agrees to sponsor the data connectivity of the first user terminal so as to permit the data connectivity required for the service to be provided; sending, by the application service provider, to the AF, a message, hereinafter referred to as "first sponsoring message", comprising: an identifier of the second user terminal sponsoring the data connectivity of the first user terminal; and an identifier of the service to which the sponsoring relates; an identifier of the second user terminal sponsoring the data connectivity of the first user terminal; and an identifier of the service to which the sponsoring relates; sending, by the AF, to a network node hosting another policy and charging rules function, said network node being hereinafter referred to as "second PCRF", another message, hereinafter referred to as "second sponsoring message", comprising an identifier of the service to which the sponsoring relates; sending, by the second PCRF to the AF, another message, hereinafter referred to as "third sponsoring message", comprising the sponsored data amount; and sending, by the AF, to the first PCRF, another message, hereinafter referred to as "fourth sponsoring message", comprising: an identifier of the second user terminal sponsoring the data connectivity of the first user terminal; an identifier of the service to which the sponsoring relates; and the sponsored data amount. an identifier of the second user terminal sponsoring the data connectivity of the first user terminal; an identifier of the service to which the sponsoring relates; and the sponsored data amount.