People answer their phones for a number of reasons, which can rapidly change, such as:
- the phone is broken
- the person can't hear well on the phone
- don't like to answer the phone or talk on the phone
- resent the intrusion
- think it's a sales call
- is talking on another line
- did not hear the phone ring
- their cellphone is turned off
- their cellphone ringer is turned off
- is in the bathroom
- is busy working
- is cooking food or eating
- is busy with a baby/child/children
- wants to be silent / not talk
- is depressed
- is sleeping
- is outside
- is mowing the lawn
- is fixing the roof
- got a new phone
- lost their cellphone
- the cellphone is playing Hide n Seek
- is getting harassed
- does not know how to tell you "I don't want to talk to you"
- OR, does not know it is you when they do want to talk to you.