Can we check the device to be smartphone by using bluetooth in flutter?
Unfortunately there isn't a way to conclusively detect only smartphones and display them. When advertising with BLE, many devices use the "GAP Appearance" flag to specify their type (e.g. phone, computer, tag, clock, etc), but not all devices follow this convention, and many devices don't use this tag, so you are bound to display devices that are not smartphones.
For more information, have a look at the following links:-
- How Bluetooth Low Energy Works: Advertisement
- BLE Specification Generic Access Profile
- BLE Specification GAP Appearance
I hope this helps.