Communicating with clients and colleagues used to be a simple matter. All you needed was a phone and some stationery. Today you need something more: flexibility.Some people respond best to e-mail. Others like the human touch of a phone call. Younger clients prefer the laser efficiency and instant gratification of texting. Others still — such as co-workers — may respond quickest to a note left on their chair.One person’s best method of communication is another person’s worst. Knowing which method to …