Why is Truecaller tracing its connection with seat belts and pacemakers? Share Via: The caller ID platformâs ongoing OOH campaign âHello Indiaâ highlights its common Swedish origin with major inventions like pacemakers and mobile handsets. Whatâs common between a carâs seat belt and leading caller ID app Truecaller? Theyâre both of Swedish origin. This bit of information is also a key part of the brandâs ongoing ad campaign, âHello Indiaâ. As a part of this OOH initiative, Truecaller is also telling the consumers that it shares its origin with othe...