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Caret pledges to smarten up your smartphone

New app from LogMeIn co-founder promises to make a smart address book worthy of an Apple or Android smartphone.

We’ve all had those moments: When an application or device marketed as idiot-proof or at least helpful proves that it is not either of those things.

And then there are the applications come out of the blue and make life easier. A few years ago, startup LogMeIn LOGM -0.31% came out with an eponymous web conferencing service which ran circles around bigger, established rivals like Cisco CSCO -1.20% Webex and Citrix CTRX 0.00% GotoMeeting.

Basically, whoever hosted meeting...