This demonstration presents an original low cost SIM Ethereum Bluetooth token (SIM_ETH_BLE_TOKEN), used from a mobile application, for the generation of Ethereum transaction. The token is based on open hardware (i.e. Arduino) and open source code. The core security is a secure element (i.e. javacard) with SIM card form factor, protected by PIN code, which stores keys and generates transactions. The token has no keypad or screen; it uses a LED and a button for user interface. The mobile application is available on Google Play. It signs files stored in smartphone, thanks to transactions, inserted in the Ethereum ledger