For what type of ticket/pass can I use NFC validation with my phone? How does NFC ticket validation work? How does NFC validation work if I have multiple types of tickets or passes? On which BKK lines can I use NFC to validate my ticket or scan my pass? Where can I activate NFC on my phone? I have an iPhone XS 2018 or older (iPhone X or iPhone 8 or lower version). What should I do? Does NFC validation work in all mobile ticket apps? Can I now only use the NFC-sticker to validate my ticket purchased in BudapestGO? NFC ticket validation does not work on my phone. What could be the problem? On which phones is NFC available?