The time-honored way to trade digits with a fellow smartphone user is to send a simple "Hi it's me!" text. Once that's done, your new friend will have your number sitting in their text-message inbox, their number will appear as an outgoing message on your phone, and you're all set—well, sort of.
While you now have your friend's number and they have yours, that's all you've got. You'll have to enter names, titles, addresses, and everything else manually—assuming you even have that information.
Now, maybe you don't care if, say, your babysitter has your office fax number, or perhaps you don't want your business colleagues to know that your AIM username is "MiniMe."
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