This was an interesting thing to contemplate! I listed some possibilities below, although this might go beyond the scope of your question. (’might’ lol)
(not listing 7 and SoP below since you already mentioned them)
Certain/almost certain mobile phone tech present in the world
FF8 - I find the idea of Adel using a mobile phone ridiculous...but it’s entirely possible that the FF8 world has mobile phone presence. At least in Esthar if nowhere else, communication tech would have been severely stunted elsewhere for the past couple decades. I mean, come on, Esthar has tech to go to the moon. Of course they have mobile phones. Once the signal interference elsewhere was lifted, the rest of the world can’t be too far behind in getting mobile phone tech. That said, Ultimecia is from the far future that we never see, there’s no telling what kind of tech she had available to her.
FF13 - oh this game definitely has mobile phones, if not smartphones or some kind of wearable communication tech. What’s a different matter is if the villains use them? I mean, the soldier head honchos definitely would have used them as well as all the main cast, but did Galenth Dysley ever bother using them? He’s a fal’Cie, he wouldn’t need them except maybe to communicate with human underlings who think he’s human...but he has said human underlings to do all the mundane stuff for him. I’d vote he never touched one.
FF15 - smartphones are confirmed for Eos. It’s unknown if Ardyn ever touched one though, he lived as a human really long ago...and who’d he call in the present day? Is he really the type to play around on a smartphone? .......he could well be, although we don’t see it.
FF Type-0 - they had at least personal communications systems suitable for the battlefield if nothing else. In this kind of war-ridden world they probably(?) didn’t have smartphones, too much of a leisure thing, but personal communication devices are present and accounted for and essential in the battlefield. And if Byakko did have something like smartphones...well, Cid most certainly had access.
FF Dimensions II - the future world would definitely have smartphone-capable tech. What remains under question is if they bothered making them, they’re very...docile, the people of the future. No drive to do anything. And in any case, stuff seems to be controlled by their wristlet devices, they might have moved on. Technically there’s no villains capable of using such tech even if it exists, though, since they tend to be more forces of nature kind in this game!
FF Spirits Within & Unlimited - SW world most definitely had mobile phones at least, no doubt about it. Smartphones are missing only if nobody bothered continuing to make them after the phantoms arrived. As for Unlimited, the starting world might have had mobile phones, although I doubt they were quite up to smartphones yet.
More tentative presence of communicative tech in the world
FF4 - it’s entirely possible that the lunarian civilization has (or at least once upon a time had) something comparable, albeit crystal-based. Ever looked at all the tech in the Lunar Whale? It’s entirely possible they had something like mobile phones, which could mean that Zemus used them once upon a time, or that Golbez might have gained access post-OG. Although, who’d he call, what with all the lunarians asleep....
FF9 - Gaia likely doesn’t have any, but Terra? Considering the advanced level the Terran civilization must have, Garland most likely has access to such tech. Although who’d he call if he did bother making himself a phone? It’s probably stored away in information databases somewhere, ready for the re-establishment of Terran civilization. Now, other types of personal communicative devices though...it’s possible some of the more advanced genomes had them to be on call for Garland’s experiments. I doubt Garland would have given anything too advanced to Kuja though, for many reasons.
FF10 - the current civilization doesn’t have access to such things I’m pretty sure, but Zanarkand? Who’s to say. And since dream Zanarkand was based on the real one, Jecht (and Tidus) might have had them.
FF12 - there’s something resembling radios at least, and since this is a civilization with flying taxi cabs... I wouldn’t consider it out of the question for them to develop the tech soon. I wouldn’t even consider it out of the question if the higher echelons of Archadia have (at least experimental) versions already. Therefore, Vayne most likely has access to whatever their closest equivalent is.
FFTA/TA2 - to be more exact, the origin world in these two games. I think they might have some primitive brick-type ‘mobile’ phones, considering that they have video games. It doesn’t seem like they’re quite up to smartphones yet though, I get the feeling that they’re a decade or two out. That said, all the villains are from the worlds beyond the Grimoires, not from the origin world/time, so they wouldn’t have had access.
FFCC Crystal Bearers - I was unable to confirm with my weak memories of the game, but the tech level seems about right to have something resembling mobile phones. It’s another game with advanced magitek, and they have magitek-powered lasers and full-color screens and such. I figure mobile phones wouldn’t be too far out, so Jegran likely had access to such if they did have them. Someone’s gonna have to help out here, my Wii is borked and I don’t have other means of accessing the game.
Magic-based communicative devices present in the world
FF11 - no tech as such in the present world, but there’s at least linkpearls? It’s nothing as fancy since it’s single-purpose for communication only, but personal communicative devices definitely exist! As for the Zilart civilization, there’s no telling what they had or didn’t have. Eald’narche and Kam’lanaut might or might not have had something like mobile phones.
FF14 - there’s linkpearls again. And, well...uhh....I may or may not be severely behind on the story so I can’t comment further on the possible presence of smartphones in certain more advanced civilizations. It’s...entirely possible?
I think that about covers the series!