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Hi @Janperez,
This could be caused by incorrect APN settings.
Try clearing your current APN settings,
Settings > More > Mobile networks > Access Point Names > [menu] (the three dots) > Reset to default.
Download your current network providers APN settings again after doing this,
Settings > More > Internet settings,
then restart your phone and try using tethering again.
I have the same Problem with my Z5 E6653 !!! i did framat the phon and i did check the APN setting , but thing works untill now ?!!! O.o any Idea ...