Is taping cell phone conversations possible?

Tapping cell phone can be authorized with the due permission of government.This is done quite secretly. It may be possible that your competitors are tapping your cell phone to know your confidential information. To tackle this,

1. You can engage a private detective service to know whether your phone has been tapped. They are resourceful about gaining information about such tapping.
2. Change your cell number and cellular service operator and do not talk always from a fixed number.
3. Hold talks with very important persons either from different cell phone numbers or assign a particular number to a fixed group of people.
4. Different governments have different rules about right to information in various countries. Inquire whether the law of your own country, you can access the information about your phone tapping.