For telephones I recommend either Skype, Google Voice, or my latest favorite, Sideline. Sideline is an application that uses your mobile phone infrastructure but gives you a unique number.
Kwa simu mimi kupendekeza ama Skype, Google Voice, au favorite yangu karibuni, Sideline. Kutokufanya ni maombi ambayo inatumia yako miundombinu simu za mkononi lakini anatoa idadi ya kipekee.