Lebara Internet APN-Einstellungen für Samsung Galaxy J3

Go to Settings,
Mobile networks,
then select Access point names

Press the Menu and select New APN

Enter name: Lebara Internet
APN: internet.t-d1.de
Proxy:
Port:
Username:
Password:
Server:
MMSC:
MMS Proxy:
MMS Port:
MCC:
MNC:
Authentication type:
APN type: default,supl

Keep the default values set by device for all blank fields shown above.