I work from home calling up companies on my employers behalf on self employed Can I

[childrenproblems]

use my database for others? I work from home calling up companies {business to business } on my employers behalf on self employed basis Can I use my database for other companies in the similar industry or not.

financially times are hard what other good or correct ways can I use my database to make money legimately without causing any damages to any1

Please advise
The database is not supplied by my employer it is infact collected and updated by me on a daily basis.