You can normally pair and use multiple devices to Bluetooth on your mobile device. There might be some limitations around using multiple devices simultaneously with the same service, e.g., connecting multiple audio devices to listen to the same music, but multiple separate services should work alongside each other without any issues. For example, I listen to my music via Bluetooth hesdphones while my Libre 2 happily keeps sending its readings to my phone at the same time. Theoretically, there will be some limitations around total bandwidth for Bluetooth, but I don't think devices like CGM or heart minitors will reach or exceed these as data volumes transferred are miniscule compared to listening to music.