Smartphones are very useful in every field these days.
Blood pressure can be checked with smartphones using a special hardware.
There are many BP monitors which can connect with smartphones using Bluetooth.
BP monitor devices usually come with a companion app.
By installing these app users can check the BP from the hand and share it on the mobile with the help of the app.
There are many apps that claim that they can check BP using Mobile camera.
The result accuracy of these are always doubted, people should consult doctors regarding this.