Everybody: Please don't buy the app under the assumption that a future update will make it work. If it doesn't work now, it's an issue with your handset's firmware that is almost certainly not fixable from the app's side. This whole program is more of a hack than anything else - the function is clearly not officially supported by Google.
The antivirus report has confirmed that BTmono is completely safe for usage. Bedoig is the creator of this application which is listed among the Tools category. The latest update was on Aug 11, 2018 and the app was downloaded and set up by over 1M users.
Google Play displays that BTmono is rated 3.6 by its users. Advertisements are a part of this application. Many users installed the app on their Samsung and Micromax devices.
A free .apk installation package of BTmono 1.3.2 is available from Droid Informer and you can check out users' reviews on this site. Prepare 290 KB of free space on your device for this app installer.
As users mention, you can find a nice UI and full functionality among the benefits of the app. The way users see it, the weak side of this application is Bluetooth issues.