S. No.

Characteristics

Classifications

1

Frequency of use

Non-regular use (<1.5 years)

Regular use (>1.5 years)

2

Life-time years of use

≤1 Years - 3 years>

≤3 years - 5 years>

≥5 years

3

Number of calls per day

Dialed calls Received calls

4

Hours of use per day

≥1 hours

<1.5 hours - 3 hours>

≤3 hours - 5 hours>

5

Mode of use

Ringing mode Vibration mode Both (Ringing + Vibration)