Table 1. Properties of the data sets.

Data set	Type	Dur.	Calls	Phones	Time	Spatial resolution n	Dir.
France	Mobile	120 bn.	800 m.	14 m.	45 days	17,800 cell towers	yes
UK	Landline	452 bn.	7.6 bn.	47 m.	1 month	4800 exchange areas	no
Italy	Landline	410 bn.	n/a	n/a	55 days	200 regions	yes
Belgium	Mobile	35 bn.	200 m.	2.6 m.	6 months	600 municipalities	yes
Portugal	Mobile	56 bn.	440 m.	1.6 m.	15 months	2200 cell towers	yes
Ivory Coast	Mobile	6 bn.	62 m.	5 m.	2 weeks	1100 cell towers	yes
Saudi Arabia	Mobile	570 bn.	2.7 bn.	14 m.	30 days	500 cell towers	yes

Country-wide telephone data sets are provided by single telephone operators, covering different time frames, with different numbers of phones, calls, total call durations (Dur.) and on various spatial resolutions. The abbreviations bn. and m. stand for billion and million, respectively. Resolution numbers are given as approximate values. These locations constitute the nodes of the corresponding telephone call networks, while the sum of durations of calls between locations span their weighted links. The last column (Dir.) denotes if the network is directed.