At the Mobile World Congress 2014 in Barcelona, i'm presented its i'm Tracer www.imtracer.com: a wearable gps tracker thought for children, elders, and pets, as well as for many other uses.
It provides with localizations all over the world, through a coverage of more than 400 GSM network operators, based on an embedded data-connection sim.
Positions monitoring is carried out easily and immediately, via computer or a mobile app (iOS and Android).