For POS transactions in Euros, you will not be charged any additional amount
For cross-border transactions via POS (non Euro), a 2.5% charge will be applied to the transaction amount, with a maximum charge of €7.5.
For cash withdrawals from ATMs outside Greece – Euro, there is no commission fee.
For cash withdrawals from ATMs outside Greece and the Euro , the commission is set at 2.5%, with a maximum charge of €7.5.
You can always see the Telekom Payments transaction commission price list at: http://www.telekompayments.com and magenta.pay/gr.
Alternatively, follow the link: Price List.