I purchased this phone for a trip to Europe and not have tried it out yet. [See updated comment below.]
An annoyance, however, is that its charger uses an unusual plug: it has the two flat prongs arranged at 45 degree angles, for use in only Australia, I think. They include an adaptor for to convert to plugs used in the US, but now this means I have to use *two* adaptors at once in Europe: first the supplied plug adaptor to convert the 45 degree angle prongs to a US style plug and then my own adaptor to convert to the local plug style in Europe. This is workable, but still annoying. I would not have ordered this particular phone had I known this. It is not mentioned on the web page anywhere.
On the plus side, the phone is attractive and strikingly thin, so it will fit will extrmemly well in a pocket.
--- UPDATED COMMENTS ADDED LATER: My son is using the phone in Spain, with a SIM card purchased there. It has been working well for him, for making and receiving calls. The phone was advertised as unlocked, and our experience confirms this.
The SIM card cost 10 euros and was preloaded with a 5 euro balance. One glitch is that he cannot send text messages from it to US phones, but this would not be the phone's fault. We have not tried sending text messages from the US to him, but our past experience on other phones is that this does not work either.