Everything is fine and as described in the previous comments. If they call you, you need to press the button on the Bluetooth headset to talk through it. Otherwise, it sounds through the phone's earpiece, and I haven't found a way to transfer the call to the headset during the call yet.

I tested it with a Bluetooth distance and it works perfectly with everything; it also collaborates with other headphones and Gigaset bases... To make the contacts in Greek, follow the instructions from Spyros _Greece

It connects easily with Bluetooth headphones (xiaomi)
I have it permanently.
You're at home - at the office and you have free hands.
Perfect

The bluetooth does not properly manage the Xiaomi headphones purchased for this purpose. The jack for the wired headphones is not up to market standards (3.5mm) but 2.5mm and requires an adapter.

Excellent phone. The bluetooth works perfectly (this was the main reason for purchase). You can connect it to the computer (it has a USB port) and transfer contacts, photos, and sounds, but the process is not very user-friendly and (the main problem) it does not support Greek characters in contacts at all

Average build quality, clear screen, good sound and volume, good range, mediocre menu slightly difficult to use, Bluetooth was the main reason for purchase for headphone use and it is good in this area, high price, generally a fair purchase

One of the good purchases with good features and very good construction... On the negative side, the instructions were only in German, the name list only in Latin alphabet even though the menus are in Greek, the menu is outdated and slow, and the Bluetooth is impossible to connect.

Simple and good phone, it has good sound quality, good range, and Bluetooth.
It does not have a Greek directory for names, only Latin characters, but it has a Greek menu.

I expected a better feel for a Siemens model. My cooperation with the store was very good. But the phone has a serious drawback. It cannot import the Greek phonebook from my mobile in Greek. It only takes English names. Strangely, the menu has a Greek language option. Aside from the problem with the Greek phonebook, the device is excellent.