@PaulusvL I found the solution yesterday. With some help from my son. I needed to change some of the settings. the used settings are in picture Now it works.

I used a TL 100. But now want to install a new TL MR 6400. I use the Tether app to add the MR 6400. i have a sim card from Odido ( T Mobie). It is the sim card I used in the 100. When I inatall the...