Inter-working of networks

In a heterogeneous network environment comprising a plurality of first wireless networks (13) and a second wireless network (11, 12), said plurality of first wireless network utilising a first wireless communication protocol and said second wireless network utilising a second wireless communication protocol different to said first, a method of gathering data from said plurality of first wireless networks, which method comprises the steps of: (a) electronically extracting a network identifier from at least one of said first wireless networks (13); (b) transmitting said network identifier to a remote server (18); and (c) said remote server (18) compiling a database of network identifiers received from said plurality of first wireless networks, storing of said database facilitating inter-working between one or more of said plurality of first wireless networks (13) and said second wireless network (11, 12).