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It's not hard to explain.
In China, the exchange of contact information (i.e. cell phone numbers) is quite common. In my 2.5 years time here, I've relinquished my number, less and less. Maybe it’s that I just don't like talking on cell phones. So, why do I even have a cell phone?
From experience being without a cell phone in a foreign country, I've found that it brings a nice level of security. I send text messages a lot, what can I say, I spam! However, I rarely make any calls unless it’s really necessary. Having my work numbers on my phone helps if I'm having difficulty communicating.
I had trouble with people sharing my number, at first. Later troubled by people who refused to identify themselves, or confess to who it was that gave them my number. One young female caller made numerous offers. I threatened to call the police if she called me again.