There is a small frame around the screen for aesthetics and for installation it will fit in any car with a double DIN slot

There is no specific wireless adapter for Android that can be connected directly to this car radio's USB port. However, the headunit does support Android Auto via a USB cable, allowing for secure and convenient integration of Android functionality into the car. For a wireless connection, external solutions or third-party accessories would have to be considered, but this is not directly supported by the car radio itself.

No

Should fit like this. It is a DIN plug. Best regards

Yes it is, that's how I installed it. The important thing is to feed the "reversing" signal to the car radio so that it automatically switches to the reversing camera when you put the car in reverse gear. I achieved this by "tapping" the power wire of the reversing light. Hope this helps.

Instructions should be included in this manual https://catalogs.pioneer-car.eu/Manuals/SPH_DA250DAB_OPM_SPHDA250DABEW5_EG_manual/

A DAB+ antenna is included with the "SPH-DA250DAB-AN".

The datasheet should list all compatible models: https://www.pioneer-car.eu/de/de/products/sph-da250dab Otherwise, ask your garage or specialist dealer.

The radio itself does not have a navigation system, but you can use Google Maps via Androidauto/Apple Car Play.

The antenna is not included! To use the old antenna you need a special converter. However, it is an advantage to be able to test this, as it is not guaranteed that the reception is really good. I was lucky, the reception on DAB+ is better than on my old device with the special DAB+ antenna, the standard FM reception is not so good. But since Switzerland is very well developed, this will soon no longer be a problem.

I don't think the vehicle matters as long as an adapter is available. My device is in a VW Sharan.

I think so, but I'll check to make sure.