Is buying shares in a telecommunications company whose business operations involve some questionable aspects (such as competitions based on text messages and investing a portion of its profits in interest-bearing bonds), with a premium conditioned on purchase, a reduction in the purchase price, and a guarantee from another shareholder covering losses, permissible or forbidden? If it is forbidden, what should I do with repentance? Should I sell the shares? If I sell them, am I obligated to give the entire proceeds to the poor, or should I deduct the premium value and give the remainder to the poor?