yeah same with mine just no mention of it in the menu where it should be according to asus website, very strange
I just tried another one of the Zenfone 4 Pro phones i bought, it was running android 7, no updates downloaded and would not accept dual sim either,in fact there was nothing at all in the menu reference dual sim .
just occurred to me as it is obviously flashed with vodaphone software maybe one of the sims has to be from them? or possibly the update detected it had moved to uk where dual sim is frowned upon by networks maybe if it had been activated/updated back in italy where it appears they are from it would have loaded the dual sim firmware?
I received mine today, absolutely no complaints, I'm very happy with my purchase. If anyone is looking for a case, I can highly recommend the black OtterBox Symmetry case, they can be bought off eBay for a tenner and they're excellent.
18 software updates later ! Including the latest one on the 23 May (nice to see LG still updating this phone) and also android 9 pie updated ! Its crazy the way you have to download everything in order instead of the phone just doing one huge download like apple would do . Anyway all set up for the mother dragon in law !