The FBI has issued a warning to New York residents to block these 5 numbers ASAP if they try calling you. The FBI has been warning New York residents of a lot of phone safety tips lately. The first one was last week that dealt with iPhone users and Android Users to avoid texting one another. The FBI and CISA, Cybersecurity and Infrastructure Security Agency, is warning iPhone and Android users that sending standard text messages between the two platforms puts your security at risk. So this means for example if you have an iPhone and you’re texting an Android user, you need to watch out.