Do I need a tax ID for a mobile business?

I'm doing mobile iPhone repairs by myself, no employees, to get wholesale, will I need to file for a Tax ID?

You can use your social security number for this type of business. You don't need another number.

What does your state, city and county say on that matter?

Same for business insurance?
Are you collecting state and local taxes on any service or product you sell?
And of course do you need a business license to start a business where you are?