How to win a $100 MetroCard with a simple selfie

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NEW YORK (PIX11) -- Smile. You're snapping a Subway Selfie. Finally, it could pay off.

Next time you see a blue sign announcing “Free WiFi” at a subway station, do more than just send a text or raise your eyebrows. Take a selfie with that sign for a chance to win a $100 MetroCard.

It’s part of a campaign by Transit Wireless, which is working with the MTA to install wireless and WiFi connectivity in all 279 underground subway stations by 2017.

There are four ways to get your mug in the running:

Then, vote for your photo -- and tell your friends and family to do the same -- at TransitWirelessWifi.com or on the company’s Facebook page. The picture with the top votes every week will be eligible to win.

Entries can be posted until March 26.