Hello,
I also use a GS290 and am very satisfied with this smartphone. Unfortunately, the camera leaves a little to be desired. For this reason, I have already asked to support the gigaset successor GS5 with /e/OS. In this device, the camera is much better and the battery can be changed. Maybe you would leave your support for the GS5 in the following thread. The more people decide for this device, the more likely a support will be.
Thank you very much. :o)