In order to access the Telefónica network abroad, automatic network operator selection must be activated. In addition, it is necessary in the settings of the respective terminal to turn on the option “Data Roaming”.
The data usage abroad is initially blocked at the border crossing.
This lock can be canceled by SMS message. With a reply SMS confirmed 1 & 1, that from this time on the appropriate roaming prices can be surfed abroad.
The maximum transmission speed depends on the device as well as the foreign partner network.