Is working in the buying and selling of shares of usurious and Islamic companies via telephone permissible or forbidden, and is it permissible to continue in it until a better job is found?

If you cannot differentiate between executing orders related to permissible and impermissible stocks, then this work is not permissible because it is assisting in what is forbidden. You must repent from it and seek a permissible job. It is not permissible to continue in this work except out of necessity, which is assessed on a case-by-case basis. This refers to situations where there is a fear of perishing or enduring unbearable hardship, or an inability to secure the minimum standard of living for the poor.