The phone came with a very small and poor manual in French, but luckily I understand a few things and it wasn't difficult to immediately change the keyboard settings to English/Greek. The full manual is available in PDF format on the internet. Otherwise, it is Spartan, but it does what it says. It could have had 200+ memory slots instead of 120, with the ability for double entries under each name (e.g. home/mobile or home/office), but it's not a big deal. It has an answering machine for recording messages up to 30 minutes in total, as well as call blocking. Decent design, although it gives you the feeling that it will fall apart if you don't take care of it. Fantastic contrast on the screen with large letters, ideal for night or outdoor use in bright sunlight for those who have poor vision, such as the elderly. It replaced a previous model from Panasonic that served faithfully for many years. It doesn't have the super range and signal of Siemens/Gigaset that I had before, but it works fine around the house. This particular model also supports intercom with another handset. A decent proposal for 60 euros including cash on delivery and shipping.

UPDATE: 26/03/2020
The phone rings twice and then becomes silent. The store where I bought it is not responding (possibly closed due to the Coronavirus), and I'm trying to find a solution from the manual I downloaded in English on how to disable a certain option that is obviously not mentioned. Overall, the device's support is terrible to non-existent. If anyone has solved this issue, please mention it in the comments. The only "solution" provided by Panasonic is to contact the service provider (e.g. OTE) to disable the VoiceMail service (which I didn't have activated anyway). It would be good for those who offer phones in Greece through imports to test them before selling them!!

UPDATE: 10/05/2020
On Panasonic's official website, they mention as a "solution" for the bug where the answering machine goes into limbo, "ask your provider to disable the service." Something that is not true, as the service provider's answering machine is a DIFFERENT thing, which I didn't have disabled anyway. It turned out that the phone indeed has a firmware problem. In simple terms, it is a device problem (defective firmware in the batch) where the answering machine tries to activate even if it is disabled, resulting in the answering machine not working after 2 rings (which don't change even though the default is 5), and of course, someone has to rush to answer the phone in those 2 rings. And it doesn't happen with every call, but in the majority of cases.
Of course, after 2 months of frustration and not finding a solution, I returned it within the warranty period and got a GIGASET that works wonders (larger memory, repeater, SMS, wifi call, calendar reminders, baby monitor, call blocking, triple entries for names home/mobile/work, appointment and birthday reminders, etc.), it works perfectly and is roughly the same price (10 euros more). It just doesn't make coffee. Therefore, I do not recommend the Panasonic due to these issues. In the past, I had various models of Gigaset and Panasonic, it just happened that this one was problematic.