I'm traveling and need to change my SIM card in my iPhone 5s, but when I did just that I was informed that my phone does not have "bandas abiertas" (literally 'open bands'). I don't know how to change my phone to allow new SIM cards abroad, and when I try to use Verizon's live chat, the webpage is unresponsive. If anyone could tell me how to get bandas abiertas, or actually get in touch with Verizon through live chat, I would be immensely grateful.