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Meine mobilen Daten gehen nicht mehr, ich habe auch meine Sim Karte in ein anderes Handy gemacht da geht alles einwandfrei
Aber auf meinem Handy kann ich nicht fihl machen, ich bin auch nicht mehr erreichbar nix
Bitte helft mir
Oder kann ich das Handy umtauschen? Es hat noch Garantie aber ich habe keine Papiere bekomme.
My mobile data is not working anymore, I have also made my Sim card in another cell phone because everything goes perfectly
But on my phone I can not feel, I'm no longer reachable nothing
Please help me
Or can I exchange the mobile phone? It still has warranty but I have no papers.
GT
Hi @Jennifer222, welcome to our forum and I'm sorry to hear about this. 
Your question has been translated to English as this is an International forum.
Have you tried downloading the Internet settings again in your device? You can do so if you go to Settings > More > Internet Settings > Accept. Wait for them to be downloaded and restart your device.
If you still can't access the Internet when mobile data is activated, please follow the recommendation given by @uliwooly and try a different SIM card in your device.
Keep us posted!