Yes, Atmotube can be used with multiple smartphones, one by one.
Atmotube can only maintain a Bluetooth connection with one device at a time, so you can use it with multiple smartphones (one at a time) with the following considerations:
If Atmotube is connected to one smartphone, it is completely invisible for other smartphones.
When several smartphones with the Atmotube app installed are nearby, disable Bluetooth on the smartphones you currently do not use so it cannot connect to the Atmotube.
Atmotube data history can be synced only once. After the sync, the history data is transferred to the app to free up on device memory so it cannot be retrieved with the other smartphone.
Please check out our detailed guide: Data Storage and Collection