Where are you calling from?

English as a Second Language English Vocabulary, Grammar and Idioms
1
  1. Where are you calling from? Business or residential?
  2. Are you calling me from a business number or residential number?
  3. Are you calling from a business number? What company do you represent?
  4. We have decided to go with the security system services from other company.
  5. We have decided to hire the security system services from other company.
  6. We have decided to obtain the security system services from other company.
  7. I will make changes when I think there is a need for it.

Are the above sentences correct? Please advise.

2
  1. Are you calling from a business number or residential number?
    ‘Where’ is not relevant as it is a place.

4)… from another company.
5)… of another company.
6)… from another company.