UPDATE:
With the latest update (version THA33.31-40), the following problem has been resolved. So, I will simply leave the original review for historical and practical reasons (e.g. for someone to know what problem they may encounter when purchasing the phone or any Motorola device in general, for all owners to proceed with the update, etc.).
The rating is now four (4) stars objectively for the phone, but of course, the whole story lasted for 3 months and more - kudos to my mother's patience in using it (but also the terrible customer service from 3rd party stores in such cases... no discussion about refunding or immediately replacing the device).
In short: the problem with the calls no longer exists (with update version THA33.31-40), the phone is a decent affordable device, and I will not buy Motorola again (at least for the next few years). Whoever gets burned by it...
----------------------------------------------------------------------------------------------
!!! ATTENTION TO ANYONE CONSIDERING PURCHASING !!! READ THIS !!!
I bought the phone for my mother and set it up myself (transferring data from Samsung S9+). At first glance, the phone seems very satisfactory for its price (165 euros) - acceptable quality, very fast (8GB RAM), and with "clean android" / without bloatware, good screen with the 90Hz display, good camera, not tested for gaming and won't be used for that, but okay for everything else...
!!! BUT... !!!
The phone has a SERIOUS KNOWN problem that no one mentions in the reviews (if it hasn't happened to others, then all is well... otherwise, write an update, guys!).
During a call, and seemingly at random times and locations, the sound stops working for the owner. Meaning, you stop hearing the person you're talking to, while they can still hear you (their microphone works fine) and the call continues normally. So far, it has happened in about 70% of the calls, as I mentioned in different locations and at different times (e.g. sometimes it happens after 1 minute of the call, the last time it happened after 6:30 minutes of the call), but always shortly.
The problem is known in the forum, and the moderators have suspiciously stopped being active in the discussion - see here (with relevant complaints from users):
https://forums.lenovo.com/t5/moto-g23/Sound-keeps-cutting-out-g23/m-p/5229469?page=7
I will try two possible solutions I found online in the next few days and will update - but until then, 1 STAR AND BEWARE TO ANYONE CONSIDERING PURCHASING!!!
Edit: I have tried every relevant or "random" solution I found on any forum, regardless of what is written in the above link (official Lenovo/Motorola forum). No progress, the problem persists. The 1* rating remains, and I seriously recommend AVOIDING THE PURCHASE of this phone. Also, I cannot verify it, but users in the above forum claim that it happens with other phones in the series as well - so be careful.