And those are trivial to get around. However, phone verification is a lot harder to get around. Maplestory 2 Items can be as straightforward as responding to a text message, or receiving a telephone call and moving through an automated system (eg. "Punch in your pic to verify that you are the person who made this account.") , so that nobody is excluded if they do not have a cellphone.
They also must tie each telephone number to a particular account. This way, once a bot account is banned, it will require a new telephone number to generate a new account. Phone numbers, while plentiful, are far far less abundant than ip addresses are.
This puts a huge barrier that only gets more effective over the years (as more and more phone numbers are obstructed ) against bot accounts. However, it does not hamper legitimate players in all (because, honestly, in case you've got a computer which can run MS you have access to a telephone of any sort ).
I understand there are a number of disadvantages, but I don't think they are large enough to justify not implementing this system. The biggest disadvantage I can see is a bot/meso farmer uses your phone number and has it banned until you attempt to produce your account. In that scenario, there could be a rather intensive way to clear a telephone number (it would have to be intensive to be an effective ban).
Either that or you're out of luck, however, the probability of that happening anyway are slim to none to start with. Additionally, nexonNA could mechanically ban phone numbers from all countries outside the serviced nations, thus making it harder for chinese meso farmers to work (they would require a large supply of American/canadian phone numbers and corresponding phones available to create more bots).
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