[LG V30 Questions & Answers] JayKiddo:
OK wow, you really do know your stuff, sorry for the late reply but I've been busy and there's a lot here to take in, and I've still got more than a few questions if that's OK, not that you haven't explained a lot already but your post arose new questions. First of all, you say if a seller says the phone is unlocked (either carrier or factory unlocked, right? Same thing I'm guessing), then I can buy it confidently, does that mean I don't need to worry about different bands being compatible with the specific model I'm buying, since it's unlocked anyway? Or does that just mean that the phone can work with another carrier's SIM card, but data might not work then? As I've said, if I can choose I'd prefer the V35 over the V30 (don't care about the storage since I can use an SD card anyway, processor and RAM are my priority), but it seems like that one has more issues with compatibility, both in terms of updates and also after having checked the Frequency Check website schwinn8 recommended, though again, I assume if the phone is unlocked none of the bands compatibility issue matter. In any case, I'll send you a private message with a link to the seller page for the V35 deal I'm looking at right now, since I'm new in the forum and it won't let me post links like that on here, and hopefully you could help me figure out if that could work with Movistar's data connection and its LTE bands, if that's not too much to ask. I also need to say that I'm planning on buying the phone while in the US, since I'm taking a long trip there starting next month and was planning of taking advantage of that so I don't have to pay for the massive shipping costs to Spain. However, that means that basically I won't be able to make sure data works using the phone in Spain until I come back, and by then the 30-Day Return period will have ended, so I just need to know for sure that it'll work, that's why I'm asking about the whole unlocked thing and what it actually means.

Apart from that, I kinda need to ask about differences between a few other things you commented on. Basically, I don't understand much about what cross flashing, the Frankenstein method, or bootloader unlocking/rooting consist in. I don't know what the risk associated with each of this processes is or what each is looking to accomplish (I do understand Frankenstein allows you to unlock the V30, and change it so it becomes a US998, so to say, as you well explained, but that's about it), but I do know I wouldn't want to do anything that could brick my phone, I had a friend with a Nexus phone who had that happen to him (think he was rooting, not sure though) and I wouldn't trust myself any more than him to do anything that involves that type of risk, since I'd probably mess it up. So please keep that in mind, I understand you might find these type of things somewhat easy to do since you're way more experienced in them, but I'm quite wary about them. So, that being said, in case I end up buying a V35, I would definitely want to cross flash, since I do wish for updates, is that too difficult or risky? If it is I could just buy the V30, hopefully with the Frankenstein method done to it already, so I don't have to change anything myself.

That's pretty much everything I needed to ask, thanks a lot again for your reply, it's much appreciated, especially given my position as a newbie in the Android world.