Sony ILCE-7CM2 Help Manual page 507

The camera can be paired with up to 15 Bluetooth devices, but can link the location information with that of only one smartphone.
If you want to link the location information with that of another smartphone, turn off the [Location Information Linkage] function
under [Setup] in Creators' App on the smartphone that is already linked.
If the Bluetooth connection is unstable, remove any obstacles, such as people or metal objects from between the camera and the
paired smartphone.
The communication distance for the Bluetooth connection or Wi-Fi may vary depending on the conditions of use.
Related Topic
Functions available with a smartphone (Creators' App)
Pairing the camera with a smartphone (Smartphone Connection)
Bluetooth Settings
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