Ask your employer to draw up a contract between you and him or ask him to give you in writing the terms and conditions of your employment.
The use of private cell phones at the work place should be limmited to emergencies only.
Example: Useing your cellphone (sosial networks) while on duty constitudes you being absent from your work for what you are not employed for.
Smoke breaks can also be seen as abcent from your work.
Lunch hour deduction:is the time you rest or eat and is not payable by the employer , unless you are required to work in that time.
Hope this helps
Ps:Look in to having more (in writng) clarity about your job requirements.