I'm looking at my tmobile cellphone bills for the past months, and for my average $70 family plan, I pay around $9 for tax. I live in California. Does the tax vary from company to company? How much would the tax be for the $70 family plan of AT&T?

Tax varies by state to state, not company to company, so if the plans cost the same, so should the taxes.

It varies from state to state. Think it through: clearly, a *company* does not set tax laws for a state or for the federal government; the governmental entity's legislative body does that.

It varies from state to state. Think it through: clearly, a *company* does not set tax laws for a state or for the federal government; the governmental entity's legislative body does that.