A:AnswerYes Dual Sim means you can have two sim cards. One for local, or international, or both for same country. You get two phone numbers on one phone! Plus you can add a micro sd card. :-)
A:AnswerNo if your sim card is already activated with the carrier you do not need to re-activate it. Unless you lost your sim card and need a new one then you will have to notified your phone carrier you need a new sim card and activate it.