sums up the basic idea behind my research quite nicely and shows a class of students at Nottingham University Business School. Students are connected by arrows if they communicate with each other and a clustering according to nationalities (shapes) and mobile phone operators used (colours) is very obvious. Students from certain nationalities interact mainly with each other and friends tend to choose the same operator, as calls between two subscribers to the same network are cheaper.



















The nodes are codes as follows:
Circles=>British, Squares=>other Europeans, Up triangles=>Chinese, Diamonds=>other Asians,Down triangles=>Africans, Plus=>the Americas
White=>”3”, Black=>O2, Grey=>Orange, Blue=>T-Mobile, Dark green=>Virgin, Red=>Vodafone, Light green=>other operators

                                                                                                                                                        >> Daniel Birke