Table 1.

Interview guide assessing participant's beliefs towards value added services

Constructs in general	Questions
General questions	What do you understand of value added services (VAS)? How much do you know about VAS? What are your expectations towards VAS?
Attitude	What do you think are the advantages of using VAS? (What are the positive feelings of using VAS?) What do you think are the disadvantages of using VAS? (What are the negative feelings of using VAS)
Subjective Norms	Who do you think would approve or support you if you use VAS? Who do you think would disapprove or discourage you from using VAS?
Perceived Behavioural Control	What are the factors or motivators that make it easy for you to use VAS? What are factors or barriers that make it difficult for you to use VAS?
Demographic (separate sheet)	Name, age, gender, ethnicity, marital status, education and income