According to the information I found on Oppo.com for the Reno13 under Specs, the Reno13 is eSIM capable.
SIM Card Type
Nano-SIM card, Nano-USIM card + eSIM
The frequency bands are slightly different depending on the version. Unfortunately I can't find any further direct information on the bands, but all of them should work in the DACH area including 5G.
Hope this helps.
The internal memory is not expandable, and the device is not designed for microSD card expansion. Depending on the model variant, the storage capacity is fixed and ranges from 256 GB to 1 TB.
The OPPO Reno13 5G has a 50-megapixel main camera. There is also an 8-megapixel ultra-wide-angle camera and a 2-megapixel monochrome camera on the back. The front camera also offers 50 megapixels.