Abstract: A method of reallocating charges relating to one or more connections from a first subscriber 1 of a mobile telecommunications network 1 to a second subscriber 2 of that or a different mobile telecommunications network. The method comprises temporarily linking the accounts of the two subscribers maintained in the or each associated Cost Control Node 9,16, receiving at the Cost control Node 9,16 associated with the first subscriber, real time charging messages according to the CAMEL protocol, and allocating the charging messages to the account of the second subscriber including, if necessary, transferring the charging messages to the Cost control Node 17 associated with the second subscriber.