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Most people are averse to giving out phone numbers because it is a piece of personal information that can be easily geographically traced, and if it's a landline, not easily discarded (i.e. you can turn off ICQ, but not a landline). The other advantage to ICQ, bar its more anonymous nature, is the fact that it logs all the conversation, and people can leave offline messages and later come back and see what they had said; you can't do that with voicemail and the like.
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