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Jehovah’s Witnesses believe that from the time of his rebellion until 1914 Satan was able to move about in the spiritual realm where Jehovah,Jesus and the faithful angelic host dwell, and in the realms of the earth. After being cast out of the heavens Satan and his demon hordes can never again come into Jehovah’s presence.
In an article that discusses what the Bible says about Satan in the June 2013 Awake magazine we read:
Satan is a spirit creature, so he lives in an invisible realm. For a time, Satan was allowed to move about at will where God and the faithful angels reside. (Job 1:6) Now, however, he has been evicted from God’s presence and, along with other wicked spirit creatures, is confined to the vicinity of the earth.—Revelation 12:12.
Does this mean that Satan is limited to one specific place on earth? For example, you may have read that the ancient city of Pergamum was said to be “where Satan is dwelling.” (Revelation 2:13) Actually, that expression alluded to the concentration of satanic worship there. Satan does not call any one physical place on earth home. Instead, the Bible says that “all the kingdoms of the inhabited earth” are his.—Luke 4:5, 6.
So it is not that Satan couldn’t come to the earth before 1914. He could come and go as he pleased. But after 1914 Satan was grounded as it were,passport surrendered,only able to influence affairs pertaining to the earth. The deterioration of world conditions that historians agree began around 1914 like world wars, famines and epidemics like the Spanish influenza are thought to be strong evidence of Satan’s being confined to the vicinity of the earth.
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Satan didn't need to be hurled down to the earth in order to go there. Angels can freely travel between Heaven and Earth, as described in Jacob's dream at Genesis 28:12.
Then he had a dream, and look! there was a stairway set on the earth, and its top reached up to the heavens; and there were God’s angels ascending and descending on it.
The wording of Job 1:6-7 and Job 2:1-2 suggests that the conversation Satan had with God actually happened in heaven, since he came "from ... the earth" to present himself to God. The Bible is clear that heaven is God's dwelling place (1 Kings 8:30, 39, 43, 49; 2 Chronicles 6:33, 39), and Hebrews 9:24 also describes how Christ entered heaven in order to appear personally before God.
Here's an article which explains why Jehovah's Witnesses believe Satan was cast out of Heaven to the earth shortly after Jesus was enthroned in 1914. Also, here's an article which explains how Jesus' statement at Luke 10:18 was also a prophecy about Satan being hurled from heaven in the future.
On a related subject, Jehovah's Witnesses don't believe God is omnipresent. For more information, see Does God Dwell in One Place? or Is God Omnipresent?