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This question was phrased by the source as follows: “Do you personally use a mobile phone? (Single code)”. 
The source defines the social classes as:
A — higher managerial, administrative and professional;
B — Intermediate managerial, administrative and professional;
C1 — Supervisory, clerical and junior managerial, administrative and professional;
C2 — Skilled manual workers;
D — Semi-skilled and unskilled manual workers;
E — State pensioners, casual and lowest grade workers, unemployed with state benefits only.