How does the service operate? For the operation of the service, you need a smartphone or tablet with internet access and an mPOS card reader (pocket size) connected with your device via Bluetooth technology. The mPOS card reader is provided by Piraeus Bank. After the installation of the mPOS application on the device you have selected is completed, the transactions are performed very easily in 3 steps: Open the mPOS application. Enter the transaction details. The card is read by the mPOS device. Transactions are carried out by inserting the card into the device in order to read the chip or the magnetic stripe. The transaction is approved by either entering the PIN or through the client's signature. The Piraeus Bank mPOS application works on devices with Android© and iOS© software.