The Protect Scotland app has already told more than 100 Scots to self-isolate, Nicola Sturgeon revealed.
First Minister Nicola Sturgeon slammed the 'despicable' scammers.
The 'Protect Scotland' proximity app which aims to help fight the spread of Covid-19 is available for free download.
The NHS programme is designed to reduce the risk of the virus spreading.
The First Minister said contact tracing has been completed on 481 positive coronavirus cases.
The Scottish Government had set a target of having 2000 tracers by the end of May to support its mass Covid-19 testing regime.
Scotland's test, trace and isolate regime will go live on Thursday, Nicola Sturgeon said.
Education secretary John Swinney says he is 'wrestling' with the issues amid plans for a phased return to schools in August.
Health secretary Jeane Freeman told MSPs work was under way on 'building up' existing health apps.
Outlining a 'test, trace, isolate' strategy, Nicola Sturgeon said it would help lift lockdown but is not 'a quick fix'.