T-Mobile has just unveiled its FamilyWhere Check-In app, a free feature of the FamilyWhere service. The FamilyWhere service is exclusive to T-Mobile customers, and can be downloaded from the Android Market.

According to Comscore, last March over 16 million U.S. mobile subscribers used a “check-in” service, to mark their their locations with their phones. FamilyWhere allows T-Mobile customers to send a text message with their location to friends and family with one click. The text message includes a link to a map, which can be accessed online. Features of the FamilyWhere app include:

On-demand location – Easily locate all devices on your account any time they are connected to T-Mobile’s network.
Broad device support – Even locates devices without GPS and without installing any additional software.
Automatic alerts – Schedule SMS or email alerts whenever family members aren’t where they’re supposed to be.
View locations from anywhere – From the convenience of your Android device or from any Web browser, you can verify your family’s whereabouts.

Torrie Dorrell, vice president of Applications, Content and Games for T-Mobile USA, states, “we’re proud to offer the check-in feature to consumers with no additional fee or subscription required to share location with friends and family, regardless of network. The expansion of our FamilyWhere suite of services is just another way we’re demonstrating our ongoing commitment to providing amazing, affordable services to consumers across carriers.”